[BUG] ppa in pkgrepo.managed breaks sources.list

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Description
I am trying to use PPA on Debian (Raspbian). But it always results in

     Comment: Failed to configure repo 'kodi-packages': E: Malformed line 5 in source list /etc/apt/sources.list (type)
              E: The list of sources could not be read.

With each unsuccessful run of the state, a state name is appended to sources.list:

$ cat sources.list
deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
# deb-src http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi

kodi-packageskodi-packages

python-apt is installed:

$ wajig list python-apt
ii  python-apt                           1.8.4.3                             armhf        Python interface to libapt-pkg
ii  python-apt-common                    1.8.4.3                             all          Python interface to libapt-pkg (locales)

Setup

kodi-packages:
  pkgrepo.managed:
    - humanname: Kodi PPA
    - ppa: team-xbmc/ppa
    - require_in:
        - pkg: kodi
  pkg.latest:
    - name: kodi
    - refresh: True

Steps to Reproduce the behavior
Install python-apt on raspbian and apply the state above.

Expected behavior
PPA is added and package is installed.

Versions Report

salt --versions-report

(Provided by running salt --versions-report. Please also mention any differences in master/minion versions.)

<> salt --versions-report
Salt Version:
          Salt: 3003.1

Dependency Versions:
          cffi: 1.14.5
      cherrypy: Not Installed
      dateutil: 2.8.1
     docker-py: 5.0.0
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 3.0.1
       libgit2: 1.1.0
      M2Crypto: 0.38.0
          Mako: 1.1.4
       msgpack: 1.0.2
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: 2.20
      pycrypto: 3.10.1
  pycryptodome: 3.10.1
        pygit2: 1.6.1
        Python: 3.9.5 (default, May 24 2021, 12:50:35)
  python-gnupg: Not Installed
        PyYAML: 5.4.1
         PyZMQ: 22.0.3
         smmap: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.4

System Versions:
          dist: manjaro 21.0.7 Ornara
        locale: utf-8
       machine: x86_64
       release: 5.10.42-1-MANJARO
        system: Linux
       version: Manjaro Linux 21.0.7 Ornara

$ salt-minion --versions-report
Salt Version:
          Salt: 3003.1

Dependency Versions:
          cffi: Not Installed
      cherrypy: Not Installed
      dateutil: 2.7.3
     docker-py: 3.4.1
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 2.10
       libgit2: Not Installed
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 0.5.6
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: Not Installed
      pycrypto: Not Installed
  pycryptodome: 3.6.1
        pygit2: Not Installed
        Python: 3.7.3 (default, Jan 22 2021, 20:04:44)
  python-gnupg: Not Installed
        PyYAML: 3.13
         PyZMQ: 17.1.2
         smmap: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.1

System Versions:
          dist: raspbian 10 buster
        locale: UTF-8
       machine: armv7l
       release: 5.10.52-v7l+
        system: Linux
       version: Raspbian GNU/Linux 10 buster

Start with the pkgrepo.managed state and its ppa handling, then reproduce the state on Raspbian with python-apt installed. Inspect the generated sources.list and compare it with the malformed kodi-packageskodi-packages entry. Done means the PPA is added as a valid APT source and the kodi package can be installed.

Written by the indexing model from the issue text.

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