src/goInstallTools: use `go install -v` instead of `go install -x`

`go install -x` is very chatty. Node.js child process got choked
with ERR_CHILD_PROCESS_STDIO_MAXBUFFER.

Change-Id: I70e24348b2db40bdfc99b7328d90e2b24ee7f902
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/357612
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Suzy Mueller <suzmue@golang.org>
diff --git a/src/goInstallTools.ts b/src/goInstallTools.ts
index a5381b5..5fc4aa5 100644
--- a/src/goInstallTools.ts
+++ b/src/goInstallTools.ts
@@ -257,8 +257,8 @@
 	};
 
 	const execFile = util.promisify(cp.execFile);
-	logVerbose(`$ ${goBinary} install -x ${importPath}} (cwd: ${opts.cwd})`);
-	await execFile(goBinary, ['install', '-x', importPath], opts);
+	logVerbose(`$ ${goBinary} install -v ${importPath}} (cwd: ${opts.cwd})`);
+	await execFile(goBinary, ['install', '-v', importPath], opts);
 }
 
 async function installToolWithGoGet(