plugin: remove the SolutionAssemblyInfo file

CI patches the version of this file, causing the Plugin project to have
the wrong Assembly/File versions.

Author: JohnTheGr8

Flow.Launcher.Plugin/Flow.Launcher.Plugin.csproj

@@ -62,10 +62,6 @@
     <None Remove="FodyWeavers.xml" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Compile Include="..\SolutionAssemblyInfo.cs" Link="Properties\SolutionAssemblyInfo.cs" />
-  </ItemGroup>
-  
   <ItemGroup>
     <Content Include="FodyWeavers.xml" />
   </ItemGroup>