[TASK] Invalid SQL and bad code in tslib_fe

tslibe_fe::determineId() contains invalid SQL statement (using "!=")
and bad code (variable "$idQ", missing check for start/stop dates).

Change-Id: If4c5db49a010331b5257ee33647cb23b31c5e020
Resolves: #32159
Releases: 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/6974
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter