[release] .github/workflows: fix test-long.yml syntax

Change-Id: I21a84ee5138a108f4def4b2929546dcc26f8d204
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/240177
Reviewed-by: Rebecca Stambler <[email protected]>
(cherry picked from commit 93a25eb)
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/241318

Author: hyangah

.github/workflows/test-long.yml

@@ -10,10 +10,10 @@ jobs:
   build:
     name: ${{ matrix.os }} ${{ matrix.version }}
     runs-on: ${{ matrix.os }}
-    
+
     # Not containing 'SKIP CI' in the commit message AND
     # (Either non-Windows OR triggered on 'push' (if triggered by 'pull_request', github.base_ref is not empty)
-    if: github.repository == 'golang/vscode-go' && !contains(github.event.head_commit.message, 'SKIP CI')"
+    if: github.repository == 'golang/vscode-go' && !contains(github.event.head_commit.message, 'SKIP CI')
     timeout-minutes: 20
     strategy:
       fail-fast: false