[BUGFIX] Only clear cache when "Clear configuration cache" is pressed

Hey,

these caches should generally only be cleared. The more important patch is the one in the fluidcontent repository (will be added soon). Otherwise the rebuilding of typo3temp/.FEDCONTENT takes up to two minutes on our system, which is rebuilt every time a cache is cleared (e.g. "clear TypoScript cache" / "clear pages cache" / "clear all caches").

In general, I suggest to use the Caching Framework for this process.

Sincerely,
Benni.