slighty penalize non-searchable presets

as a tie-breaker in case a searchable preset also matches the same object,
see https://github.com/openstreetmap/id-tagging-schema/issues/399#issuecomment-1039902506

modules/presets/preset.js

@@ -77,6 +77,10 @@ export function presetPreset(presetID, preset, addable, allFields, allPresets) {
       }
     }
 
+    if (_this.searchable === false) {
+      score *= 0.999;
+    }
+
     return score;
   };