Specify local dotnet command to launch lanugage service (#910)

Author: anthony-c-martin

src/vscode-bicep/src/language/client.ts

@@ -42,7 +42,7 @@ async function launchLanguageService(
   getLogger().debug(`Found language server at '${languageServerPath}'.`);
 
   const serverExecutable: lsp.Executable = {
-    command: path.basename(dotnetCommandPath),
+    command: `.${path.sep}${path.basename(dotnetCommandPath)}`,
     args: [languageServerPath],
     options: {
       cwd: path.dirname(dotnetCommandPath),