Fix quoted-prefix scriptlet expressions

[giri256]

Fixes #398

Summary

• Treat a leading quote as a wrapper only when its closing quote is followed by a comma or the end of the argument list.
• When an operator follows the closing quote, fall back to comma-delimited parsing and preserve the quote characters, matching uBlock Origin for expressions such as "test"!==undefined and "value"||something.
• Continue rejecting unmatched quotes and malformed quoted values followed by alphanumeric text, another quote, or a backslash.

Validation

• cargo fmt --all -- --check
• cargo test resources::resource_storage::unit_tests --lib (20 passed)
• cargo clippy --all-targets --all-features -- -D warnings