MB-57682: Write to INI file atomically.

Modify file2:write to always use misc:atomic_write_file.

Change-Id: Ia60e7bc59201ba327b2981d09411413670927720
Reviewed-on: https://review.couchbase.org/c/couchdb/+/193326
Reviewed-by: Hareen Kancharla <hareen.kancharla@couchbase.com>
Tested-by: Neelima Premsankar <neelima.premsankar@couchbase.com>

src/couchdb/file2.erl

@@ -60,7 +60,7 @@ read_file(Filepath) ->
 
 
 write_file(Filepath, Bytes) ->
-    do_file_op(file, write_file, [Filepath, Bytes]).
+    do_file_op(misc, atomic_write_file, [Filepath, Bytes]).
 
 
 read_file_info(Filepath) ->