scripts/test_antlr_grammar.sh: also exclude bidirectional isolate test files

The grammar cannot recursively count the LRI/RLI/FSI/PDI isolates added
to the validator any more than it can count LRO/RLO/LRE/RLE/PDF, so apply
the same skip rule to filenames matching '_isolate_override'.

Author: genisis0x

scripts/test_antlr_grammar.sh

@@ -60,9 +60,9 @@ done < <(
     "^\/\/ (Syntax|Type|Declaration)Error|^\/\/ ParserError (1684|2837|3716|3997|5333|6275|6281|6933|7319|8185|7637)|^==== Source:|^pragma experimental solidity;" \
     "${ROOT_DIR}/test/libsolidity/syntaxTests" \
     "${ROOT_DIR}/test/libsolidity/semanticTests" |
-      # Skipping the unicode tests as I couldn't adapt the lexical grammar to recursively counting RLO/LRO/PDF's.
-      grep -v -E 'comments/.*_direction_override.*.sol' |
-      grep -v -E 'literals/.*_direction_override.*.sol' |
+      # Skipping the unicode tests as I couldn't adapt the lexical grammar to recursively counting RLO/LRO/PDF's or LRI/RLI/FSI/PDI's.
+      grep -v -E 'comments/.*_(direction|isolate)_override.*\.sol' |
+      grep -v -E 'literals/.*_(direction|isolate)_override.*\.sol' |
       # Skipping a test with "revert E;" because ANTLR cannot distinguish it from
       # a variable declaration.
       grep -v -E 'revertStatement/non_called.sol' |