Removes superfluous parenthesis in sysexts "aboutmodules", "adodb",
"belog" and "beuser".

Change ("a" . "b") . "c" into "a" . "b" . "c" using the lex-pass tool.

Change-Id: I26f72a6d5e18617a0838e64068817e4fd7c1c90e
Resolves: #40962
Related: #40095
Reviewed-on: http://review.typo3.org/14620
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Jigal van Hemert
Tested-by: Jigal van Hemert