Revert "Make selection more consistent across languages (#17084)" (#17175)

This reverts commit 7db8d80c30.(#17084)

Release Notes:

- N/A

crates/languages/src/css/config.toml

@@ -9,5 +9,6 @@ brackets = [
     { start = "\"", end = "\"", close = true, newline = false, not_in = ["string", "comment"] },
     { start = "'", end = "'", close = true, newline = false, not_in = ["string", "comment"] },
 ]
+word_characters = ["-"]
 block_comment = ["/* ", " */"]
 prettier_parser_name = "css"