Update tests_eessi_module.yml

Author: ocaisa

.github/workflows/tests_eessi_module.yml

@@ -345,4 +345,4 @@ jobs:
           export EESSI_UPDATE_PS1=1
           module load "EESSI/${{matrix.EESSI_VERSION}}"
           GREP_PATTERN="{EESSI/${{matrix.EESSI_VERSION}} "
-          grep -F -- "${PS1}" "${GREP_PATTERN}"
+          grep -F -- "${PS1}" "${GREP_PATTERN}"