update API demo

Demo/API/.vs/API/xs/UserPrefs.xml

-<Properties StartupConfiguration="{92393B89-8396-FC2F-BE17-A0417C4334ED}|">
-  <MonoDevelop.Ide.Workbench ActiveDocument="Assets/Scripts/Demo.cs">
-    <Files>
-      <File FileName="Assets/Scripts/Demo.cs" Line="124" Column="115" />
-      <File FileName="Assets/WX-WASM-SDK/WXBase.cs" Line="263" Column="61" />
-      <File FileName="Assets/WX-WASM-SDK/WXSDKManagerHandler.cs" Line="206" Column="1" />
-    </Files>
-    <Pads>
-      <Pad Id="ProjectPad">
-        <State name="__root__">
-          <Node name="API" expanded="True">
-            <Node name="Assets" expanded="True">
-              <Node name="Scripts" expanded="True">
-                <Node name="Demo.cs" selected="True" />
-              </Node>
-              <Node name="WX-WASM-SDK" expanded="True" />
-            </Node>
-          </Node>
-        </State>
-      </Pad>
-    </Pads>
-  </MonoDevelop.Ide.Workbench>
-  <MonoDevelop.Ide.DebuggingService.PinnedWatches />
-  <MonoDevelop.Ide.Workspace ActiveConfiguration="Debug" />
-  <MonoDevelop.Ide.ItemProperties.Assembly-CSharp PreferredExecutionTarget="1107cd5a-a984-462c-9e53-4f04dfce54ba" />
-  <MonoDevelop.Ide.DebuggingService.Breakpoints>
-    <BreakpointStore />
-  </MonoDevelop.Ide.DebuggingService.Breakpoints>
-  <MultiItemStartupConfigurations />
-</Properties>
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