[release] src/goMain: correct showGoWelcomePage hard-coded version string

Remove the 'v' prefix.

Change-Id: I251055122f07c94a154f59bbda0cc7520db5cfd4
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/289698
Trust: Hyang-Ah Hana Kim <[email protected]>
Run-TryBot: Hyang-Ah Hana Kim <[email protected]>
Reviewed-by: Robert Findley <[email protected]>
(cherry picked from commit f2fcdb1)
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/289677
TryBot-Result: kokoro <[email protected]>
Reviewed-by: Rebecca Stambler <[email protected]>

Author: hyangah

src/goMain.ts

@@ -580,7 +580,7 @@ function showGoWelcomePage(ctx: vscode.ExtensionContext) {
 	const showVersions: string[] = ['0.22.0'];
 	// TODO(hyangah): use the content hash instead of hard-coded string.
 	// https://github.com/golang/vscode-go/issue/1179
-	let goExtensionVersion = 'v0.22.0';
+	let goExtensionVersion = '0.22.0';
 	let goExtensionVersionKey = 'go.extensionVersion';
 	if (isInPreviewMode()) {
 		goExtensionVersion = '0.0.0';