Fix solution variable

Author: jcansdale

.github/workflows/main.yml

@@ -38,4 +38,4 @@ jobs:
 
     - name: MSBuild ${{ env.githubvsSolution }}
       run: |
-        msbuild $(env.githubvsSolution) /p:Configuration=${{ env.config }} /p:DeployExtension=False /p:GitHubVS_ClientId=${{ secrets.GitHubVS_ClientId }} /p:GitHubVS_ClientSecret=${{ secrets.GitHubVS_ClientSecret }}
+        msbuild ${{ env.githubvsSolution }} /p:Configuration=${{ env.config }} /p:DeployExtension=False /p:GitHubVS_ClientId=${{ secrets.GitHubVS_ClientId }} /p:GitHubVS_ClientSecret=${{ secrets.GitHubVS_ClientSecret }}