mm/damon/core: fix damos_commit_filter not changing allow

mm/damon/core: fix damos_commit_filter not changing allow

Current damos_commit_filter() does not persist the `allow' value of the
filter.  As a result, changing the `allow' value of a filter and
committing doesn't change the `allow' value.

Add the missing `allow' value update, so committing the filter
persistently changes the `allow' value well.

Link: https://lkml.kernel.org/r/20250816015116.194589-1-ekffu200098@gmail.com
Fixes: fe6d7fdd6249 ("mm/damon/core: add damos_filter->allow field")
Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>	[6.14.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>