CI: fix display glitch. NFC

Author: whitequark

.github/workflows/main.yml

@@ -31,7 +31,7 @@ jobs:
         - amaranth-version: 'git'
           allow-failure: true
     continue-on-error: '${{ matrix.allow-failure }}'
-    name: "test (${{ matrix.python-version }}, ${{ matrix.amaranth-version }}${{ matrix.allow-failure == 'false' && ', required' }})"
+    name: "test (${{ matrix.python-version }}, ${{ matrix.amaranth-version }}${{ matrix.allow-failure == 'false' && ', required' || '' }})"
     steps:
       - name: Check out source code
         uses: actions/checkout@v3