Update build-kernel-release.yml

Author: TheWildJames

.github/workflows/build-kernel-release.yml

@@ -21,7 +21,7 @@ on:
 
 jobs:
   build-kernel-a15-zuma:
-    if: ${{ inputs.build_zuma }}
+    if: ${{ inputs.build_zuma || inputs.build_zuma == '' }}
     uses: ./.github/workflows/build-kernel-a15-zuma.yml
     secrets: inherit