fs: clear I_DIRTY_TIME in sync_lazytime

fs: clear I_DIRTY_TIME in sync_lazytime

For file systems implementing ->sync_lazytime, I_DIRTY_TIME fails to get
cleared in sync_lazytime, and might cause additional calls to
sync_lazytime during inode deactivation.  Use the same pattern as in
__mark_inode_dirty to clear the flag under the inode lock.

Fixes: 5cf06ea56ee6 ("fs: add a ->sync_lazytime method")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260317134409.1691317-1-hch@lst.de
Signed-off-by: Christian Brauner <brauner@kernel.org>