Remove php7.2 config override for typo3 and drupal7

[rfay]

The Problem/Issue/Bug:

Both TYPO3 and Drupal7 had configOverrideActions that set the PHP version to 7.2, and neither requires it.

In a recent TYPO3 test (with ddev v1.16.0-rc1), with latest deb.sury.org build PHP 7.2.34-8+020201103.52+debian101.gbpafa084 failed, even though 7.2.34-4 had worked fine.

An exception occurred while executing 'DELETE tags2, cache1 FROM cf_cache_pages_tags AS tags1 JOIN cf_cache_pages_tags AS tags2 ON tags1.identifier = tags2.identifier JOIN cf_cache_pages AS cache1 ON tags1.identifier = cache1.identifier WHERE tags1.tag = 'redirects'': Malformed communication packet

How this PR Solves The Problem:

• Remove the php7.2 setting for Drupal7 and TYPO3. Both should work fine with the default php7.3. This seems to make more sense than chasing an obscure "malformed communication packet" issue in an obsolete PHP version.

Manual Testing Instructions:

Automated testing should be fine, but I recreated it manually as well.

Automated Testing Overview:

Related Issue Link(s):

Release/Deployment notes: