fix(store): match chat_schema.sql to sqlite 3.46+ indent

The schema-dump test renders the partial-index WHERE via the sqlite3
CLI; sqlite >=3.46 wraps a multi-condition WHERE onto two lines
("IS NOT NULL" + indented "AND ...") where 3.45 kept it on one. The
committed schema was generated with 3.45, so CI (newer sqlite) failed
the comparison on idx_contacts_simplex_name. Regenerated with the
newer formatter; only that one WHERE clause changes.

src/Simplex/Chat/Store/SQLite/Migrations/chat_schema.sql

@@ -1321,7 +1321,8 @@ ON contacts(
   user_id,
   simplex_name
 )
-WHERE simplex_name IS NOT NULL AND deleted = 0;
+WHERE simplex_name IS NOT NULL 
+    AND deleted = 0;
 CREATE UNIQUE INDEX idx_groups_simplex_name
 ON groups(
   user_id,