Do not disable 3rdparty apps on occ upgrade

[MorrisJobke]

Steps:

• have calendar and contacts enabled
• do an upgrade via occ upgrade (before just change the version in config.php to a smaller number to trigger an update)
• before: both apps are disabled with output like "Disabled 3rd-party app: contacts"
• after: they kept enabled

Verify that you run on PHP 7.0+

Background: before the CLI flag was forcefully setting this option to false, which has overwritten the logic in the Updater constructor:

server/lib/private/Updater.php

Line 88 in f000e22

if(version_compare(phpversion(), '7.0.0', '>=')) {

Discussed this already with @LukasReschke - in the web UI this works already fine.

[mention-bot]

@MorrisJobke, thanks for your PR! By analyzing the history of the files in this pull request, we identified @icewind1991, @Gomez and @ringmaster to be potential reviewers.