Update FieldLevelEncryption.java (#113)

Fix for sonar issue - major

Author: ShimonaR-MC

src/main/java/com/mastercard/developer/encryption/FieldLevelEncryption.java

@@ -193,7 +193,7 @@ private static DocumentContext decryptPayloadPath(DocumentContext payloadContext
             JsonParser.checkOrCreateOutObject(payloadContext, jsonPathOut);
             JsonParser.addDecryptedDataToPayload(payloadContext, decryptedValue, jsonPathOut);
 
-            if(jsonPathIn != jsonPathOut) {
+            if(!jsonPathIn.equals(jsonPathOut)) {
                 // Remove the input if now empty
                 Object inJsonElement  = JsonParser.readJsonElement(payloadContext, jsonPathIn);
                 if (0 == jsonProvider.length(inJsonElement)) {