[BUGFIX] Fix syntax errors in ext_tables.sql files

Fix syntax errors by removing commas in excess after the last column/
key definition, add commas missing after column/key definitions and
removing default values for auto_increment columns.

Change-Id: Ica2dd1689211e56f6d9b01f7992867262cac3b5d
Resolves: #77706
Releases: master, 7.6
Reviewed-on: https://review.typo3.org/49675


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>