Improve string formatting in OkHttpJsonApiClient.java (commons-app#5916)

Author: sikehish

app/src/main/java/fr/free/nrw/commons/mwapi/OkHttpJsonApiClient.java

@@ -285,7 +285,7 @@ public List<Place> getNearbyPlaces(final LatLng cur, final String language, fina
         throws Exception {
 
         Timber.d("Fetching nearby items at radius %s", radius);
-        Timber.d("CUSTOM_SPARQL%s", String.valueOf(customQuery != null));
+        Timber.d("CUSTOM_SPARQL: %s", String.valueOf(customQuery != null));
         final String wikidataQuery;
         if (customQuery != null) {
             wikidataQuery = customQuery;
@@ -344,7 +344,7 @@ public List<Place> getNearbyPlaces(
         final boolean shouldQueryForMonuments, final String customQuery)
         throws Exception {
 
-        Timber.d("CUSTOM_SPARQL%s", String.valueOf(customQuery != null));
+        Timber.d("CUSTOM_SPARQL: %s", String.valueOf(customQuery != null));
 
         final String wikidataQuery;
         if (customQuery != null) {