Fix label indentation for Linux style in c-ts-mode (bug#60543)

Reference:
1. https://www.gnu.org/software/indent/manual/indent/Common-styles.html
2. https://www.gnu.org/software/indent/manual/indent/Option-Summary.html

The GNU indent manual says Linux style should use -il1 flag, which
means "indent labels to column 1".

* lisp/progmodes/c-ts-mode.el (c-ts-mode--indent-styles): Indent label
to column 1 in Linux style.

lisp/progmodes/c-ts-mode.el

@@ -169,7 +169,9 @@ MODE is either `c' or `cpp'."
        ((match "while" "do_statement") parent 0)
        ,@common)
       (k&r ,@common)
-      (linux ,@common)
+      (linux
+       ((node-is "labeled_statement") point-min 1)
+       ,@common)
       (bsd
        ((parent-is "if_statement") parent-bol 0)
        ((parent-is "for_statement") parent-bol 0)