Update System.Net.WebSockets.nfproj

- Remove load hints from nfproj file.

***NO_CI****

Author: josesimoes

Websockets/System.Net.WebSockets.nfproj

@@ -32,23 +32,6 @@
       <InProject>false</InProject>
     </NFMDP_PE_ExcludeClassByName>
   </ItemGroup>
-  <ItemGroup>
-    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.CoreLibrary.1.10.3-preview.7\lib\mscorlib.dll">
-      <InProject>false</InProject>
-    </NFMDP_PE_LoadHints>
-    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.Runtime.Events.1.9.0-preview.16\lib\nanoFramework.Runtime.Events.dll">
-      <InProject>false</InProject>
-    </NFMDP_PE_LoadHints>
-    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.System.Collections.1.2.0-preview.36\lib\nanoFramework.System.Collections.dll">
-      <InProject>false</InProject>
-    </NFMDP_PE_LoadHints>
-    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.System.Text.1.1.1-preview.35\lib\nanoFramework.System.Text.dll">
-      <InProject>false</InProject>
-    </NFMDP_PE_LoadHints>
-    <NFMDP_PE_LoadHints Include="..\packages\nanoFramework.System.Net.1.6.5-preview.2\lib\System.Net.dll">
-      <InProject>false</InProject>
-    </NFMDP_PE_LoadHints>
-  </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.props" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.props')" />
   <ItemGroup>
     <Compile Include="MessageReceivedEventArgs.cs" />
@@ -121,4 +104,4 @@
     </PropertyGroup>
     <Error Condition="!Exists('..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets'))" />
   </Target>
-</Project>
+</Project>