ee cli self-uninstall command does not remove the cron job created when installed

Here's the output log when I tried to uninstall it and checked crontab:

```
root@enigma:/opt# ee cli self-uninstall
Are you sure you want to remove EasyEngine and all its sites(along with their data)?
This is an irreversible action. No backup will be kept. [y/n] y
root@enigma:/opt# crontab -l
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin

0 0 * * * /usr/local/bin/ee site ssl-renew --all >> /opt/easyengine/logs/cron.log 2>&1

```

System Information

ee cli info

gagan@enigma:~$ sudo ee cli info

+-------------------+--------------------------------------------------------------------------------------------------+

| OS                | Linux 5.8.0-7630-generic #32~1609193707~20.10~781bb80-Ubuntu SMP Tue Jan 5 21:29:56 UTC 2 x86_64 |

| Shell             | /bin/bash                                                                                        |

| PHP binary        | /usr/bin/php7.3                                                                                  |

| PHP version       | 7.3.24-1+ubuntu20.04.1+deb.sury.org+1                                                            |

| php.ini used      | /etc/php/7.3/cli/php.ini                                                                         |

| EE root dir       | phar://ee.phar                                                                                   |

| EE vendor dir     | phar://ee.phar/vendor                                                                            |

| EE phar path      | /home/gagan                                                                                      |

| EE packages dir   |                                                                                                  |

| EE global config  | /opt/easyengine/config/config.yml                                                                |

| EE project config |                                                                                                  |

| EE version        | 4.1.5                                                                                            |

+-------------------+--------------------------------------------------------------------------------------------------+

lsb_release -a

gagan@enigma:~$ lsb_release -a

No LSB modules are available.

Distributor ID:	Pop

Description:	Pop!_OS 20.10

Release:	20.10

Codename:	groovy

docker version

gagan@enigma:~$ docker version

Client: Docker Engine - Community

 Version:           19.03.6

 API version:       1.40

 Go version:        go1.12.16

 Git commit:        369ce74a3c

 Built:             Thu Feb 13 01:27:49 2020

 OS/Arch:           linux/amd64

 Experimental:      false


Server: Docker Engine - Community

 Engine:

  Version:          19.03.6

  API version:      1.40 (minimum version 1.12)

  Go version:       go1.12.16

  Git commit:       369ce74a3c

  Built:            Thu Feb 13 01:26:23 2020

  OS/Arch:          linux/amd64

  Experimental:     false

 containerd:

  Version:          1.2.13

  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429

 runc:

  Version:          1.0.0-rc10

  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd

 docker-init:

  Version:          0.18.0

  GitCommit:        fec3683

docker-compose version

gagan@enigma:~$ docker-compose version

docker-compose version 1.25.0, build unknown

docker-py version: 4.1.0

CPython version: 3.8.6

OpenSSL version: OpenSSL 1.1.1g  21 Apr 2020