fix(ci): use shellcheck ignore_names for syntax-error fixture

ignore_paths only matches directory prefixes; ignore_names skips by
basename, which is what we need for a single fixture file.

Author: Chemaclass

.github/workflows/static_analysis.yml

@@ -25,4 +25,6 @@ jobs:
         uses: ludeeus/action-shellcheck@master
         env:
           SHELLCHECK_OPTS: -e SC1091 -e SC2155 -e SC2016
+        with:
+          ignore_names: test_bashunit_when_syntax_error.bash