Revert "all targets: reduce FreeRTOS minimal stack size to 48 words"

This reverts commit a9943501f4d237c8f996171e8b0cbc287f9bd0b8.
flyingf3: reduce FreeRTOS minimal stack size to 48 words
This is enough for CopterControl so it should work for all
other targets as well. The following tasks are affected:

IdleTask
TimerTask
FaultTask
EventTask

This should free 7424 bytes of heap.