remove mode selector from Probe, force JSON result

web/pages/blocks/probe.ejs

@@ -18,14 +18,6 @@
                 <div><input class="form-control" name="url" placeholder="<%-lang.Example%> : http://192.168.88.126/videostream.cgi or /dev/video0"></div>
             </label>
         </div>
-        <div class="form-group">
-            <label><div><span><%-lang['Mode']%></span></div>
-                <div><select class="form-control" name="mode">
-                    <option value="default" selected><%-lang.Default%></option>
-                    <option value="json">JSON</option>
-                </select></div>
-            </label>
-        </div>
         <div class="output_data"></div>
       </div>
       <div class="modal-footer">