Fix macOS indexstore-db preset

Author: benlangmuir

utils/build-presets.ini

@@ -1743,7 +1743,7 @@ indexstore-db
 sourcekit-lsp
 
 [preset: buildbot_indexstoredb_macos,sanitize]
-mixin-preset=buildbot_indexstoredb_linux,no_sanitize
+mixin-preset=buildbot_indexstoredb_macos,no_sanitize
 test-indexstore-db-sanitize-all
 
 [preset: buildbot_indexstoredb_linux,sanitize]
@@ -1752,7 +1752,7 @@ test-indexstore-db-sanitize-all
 
 # Default: sanitize-all
 [preset: buildbot_indexstoredb_macos]
-mixin-preset=buildbot_indexstoredb_linux,sanitize
+mixin-preset=buildbot_indexstoredb_macos,sanitize
 
 # Default: sanitize-all
 [preset: buildbot_indexstoredb_linux]