fix: don't opt-in to obsolete empty-string-compare ansible-lint rule

.ansible-lint

@@ -41,7 +41,7 @@ skip_list:
 # Any rule that has the 'opt-in' tag will not be loaded unless its 'id' is
 # mentioned in the enable_list:
 enable_list:
-  - empty-string-compare    # opt-in
+  # - empty-string-compare    # opt-in
   - no-log-password         # opt-in
   - no-same-owner           # opt-in
   # add yaml here if you want to avoid ignoring yaml checks when yamllint