test/integration/goDebug.test.ts: remove '.only' from test

There was a .only mistakenly left in the code from testing.

Change-Id: Ied126bb4592f77fcdcea5cdf81e23770c37942d8
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/307052
Trust: Suzy Mueller <[email protected]>
Run-TryBot: Suzy Mueller <[email protected]>
TryBot-Result: kokoro <[email protected]>
Reviewed-by: Hyang-Ah Hana Kim <[email protected]>

Author: suzmue

test/integration/goDebug.test.ts

@@ -1637,7 +1637,7 @@ const testAll = (ctx: Mocha.Context, isDlvDap: boolean) => {
 			]);
 		}
 
-		test.only('next', async function () {
+		test('next', async function () {
 			if (!isDlvDap) {
 				// Not implemented in the legacy adapter.
 				this.skip();