Add path parameter for file message

Author: JoshLipan

android/src/io/jchat/android/utils/ResultUtils.java

@@ -183,6 +183,7 @@ public static WritableMap toJSObject(Message msg) {
                 case file:
                     result.putString(Constant.TYPE, Constant.FILE);
                     FileContent fileContent = (FileContent) content;
+                    result.putString(Constant.PATH, voiceContent.getLocalPath());
                     result.putString(Constant.FILE_NAME, fileContent.getFileName());
                     break;
                 case custom: