Use truthy check for secret instead of string comparison

Co-authored-by: abernier <[email protected]>

Author: Copilot

.github/workflows/chromatic.yml

@@ -6,7 +6,7 @@ jobs:
   chromatic:
     runs-on: ubuntu-latest
     # Only run if the CHROMATIC_PROJECT_TOKEN secret is available
-    if: secrets.CHROMATIC_PROJECT_TOKEN != ''
+    if: secrets.CHROMATIC_PROJECT_TOKEN
     steps:
       - uses: actions/checkout@v4
         with: