[BUG] proxy.managed state do not configure Windows environment properly

Description
When applying a proxy configuration on Windows with proxy.managed state module. The proxy configuration and registry keys are properly set, but the computer environment configuration is set with the previous parameter.
It seems the netsh (https://github.com/saltstack/salt/blob/master/salt/modules/proxy.py#L142) command applies before registry keys are set with the new values.

Setup

• a Windows 2019 server

• proxy.sls

proxy_win_configuration:
  proxy.managed:
    - name: 'proxy.domain'
    - port: '3128'
    - bypass_domains:
      - '*.local.domain'

Steps to Reproduce the behavior
Before

PS C:\> netsh winhttp show proxy

Current WinHTTP proxy settings:

    Direct access (no proxy server).

Apply the sls. salt-call.bat state.apply proxy

local:
   Name: proxy.domain - Function: proxy.managed - Result: Clean Started: - 11:41:57.324156 Duration: 93.751 ms

Summary for local                                                                                                       
------------                                                                                                            
Succeeded: 1                                                                                                            
Failed:    0                                                                                                            
------------                                                                                                            
Total states run:     1                                                                                                 
Total run time:  93.751 ms

After

PS C:\> netsh winhttp show proxy

Current WinHTTP proxy settings:

    Direct access (no proxy server).

If you manually change the proxy configuration in "Internet Options" settings with test.

And re-apply the code salt-call.bat state.apply proxy
you will have :

PS C:\> netsh winhttp show proxy

Current WinHTTP proxy settings:

    Proxy Server(s) :  test:3128
    Bypass List     :  *.local.domain;<local>

which is the previous configuration.

Expected behavior

PS C:\> netsh winhttp show proxy

Current WinHTTP proxy settings:

    Proxy Server(s) :  proxy.domain:3128
    Bypass List     :  *.local.domain;<local>

Versions Report

Salt Version:
          Salt: 3003.4

Dependency Versions:
          cffi: 1.14.5
      cherrypy: 18.6.0
      dateutil: 2.8.1
     docker-py: Not Installed
         gitdb: 4.0.5
     gitpython: Not Installed
        Jinja2: 2.11.3
       libgit2: Not Installed
      M2Crypto: Not Installed
          Mako: 1.1.4
       msgpack: 1.0.2
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: 2.20
      pycrypto: Not Installed
  pycryptodome: 3.9.8
        pygit2: Not Installed
        Python: 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)]
  python-gnupg: 0.4.6
        PyYAML: 5.4.1
         PyZMQ: 18.0.1
         smmap: 3.0.4
       timelib: 0.2.4
       Tornado: 4.5.3
           ZMQ: 4.3.1

System Versions:
          dist:
        locale: cp1252
       machine: AMD64
       release: 2019Server
        system: Windows
       version: 2019Server 10.0.17763 SP0

Additional context

The issue points to salt/modules/proxy.py at line 142 and the proxy.managed state. Start by reproducing the Windows 2019 case with the provided proxy.sls and compare the registry values with netsh winhttp show proxy before and after applying the state. Done means the command reports proxy.domain:3128 and the expected bypass list on the first apply.