fs: disable dyn fsync and enable fsync

Some users reported turning off dynamic fsync
may prevent the data corruption bug, so i will
disable it by default and enable fsync back to
its original state.

This may cost a bit of performance, but at least
it can be considered as stable.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
Merge remote-tracking branch 'Quarx/AeroKernel' into AeroKernel-debug