Fix expression for test.

Author: dragetd

.github/workflows/test.yml

@@ -21,13 +21,13 @@ jobs:
         with:
           go-version: ${{ matrix.go-version }}
       - name: Install libgtk-3-dev
-        if: startsWith(matrix.os, 'ubuntu')
+        if: ${{ startsWith(matrix.os, 'ubuntu') }}
         run: sudo apt-get update -y && sudo apt-get install -y libgtk-3-dev
       - name: Install UPX (Linux)
-        if: startsWith(matrix.os, 'ubuntu')
+        if: ${{ startsWith(matrix.os, 'ubuntu') }}
         run: sudo apt-get update -y && sudo apt-get install -y upx-ucl
       - name: Install UPX (Windows)
-        if: startsWith(matrix.os, 'windows')
+        if: ${{ startsWith(matrix.os, 'windows') }}
         run: choco install upx -y
       - name: Checkout repository
         uses: actions/[email protected]