[BUGFIX] Prevent deletion of closing bracket via INCLUDE_TYPOSCRIPT

Due to missing check of the last char being a new line, it is
possible that a closing bracket character is removed by
using INCLUDE_TYPOSCRIPT.
This leads to broken typoscript.
By introducing the missing check this kind of error is prevented.

Change-Id: I92ef213d31c4d62ba797e2741d5a0beaa042c6b3
Resolves: #62280
Releases: master
Reviewed-on: http://review.typo3.org/37038


Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>