Rename EXTRACT_QUOTES to EXTRACT_UNQUOTE

Whenever I see EXTRACT_QUOTES, I'm always confused whether it means to
leave the quotes in or to take them out. Let's say "unquote", like we
say "cunescape".

src/shared/condition.c

@@ -114,7 +114,7 @@ static int condition_test_kernel_command_line(Condition *c) {
                 _cleanup_free_ char *word = NULL;
                 bool found;
 
-                r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
+                r = extract_first_word(&p, &word, NULL, EXTRACT_UNQUOTE|EXTRACT_RELAX);
                 if (r < 0)
                         return r;
                 if (r == 0)