[TASK] Remove explicit strict test from TypoScriptParserTest

The TypoScriptParser is executed in strict mode by default.

Change-Id: I95a206e184cbafaebe28f1db592bd0f6a6dda4db
Related: #46839
Releases: 6.0, 6.1
Reviewed-on: https://review.typo3.org/19504
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader