Avoid spaces in JSON output

Author: olpaw

substratevm/src/com.oracle.svm.driver/src/com/oracle/svm/driver/BundleSupport.java

@@ -648,7 +648,7 @@ private static Manifest createManifest() {
 
     private static void printPathMapping(Map.Entry<Path, Path> entry, JsonWriter w) throws IOException {
         w.append('{').quote(substitutionMapSrcField).append(" : ").quote(entry.getKey());
-        w.append(", ").quote(substitutionMapDstField).append(" : ").quote(entry.getValue());
+        w.append(',').quote(substitutionMapDstField).append(':').quote(entry.getValue());
         w.append('}');
     }