feat: open selected video channel with U

src/config.rs

@@ -400,7 +400,7 @@ fn category_name(name: &str) -> io::Result<&str> {
     Ok(name.trim())
 }
 
-fn normalize_channel(input: &str) -> io::Result<String> {
+pub(crate) fn normalize_channel(input: &str) -> io::Result<String> {
     if input.chars().any(char::is_control) {
         return Err(invalid(
             "Channel addresses must contain no control characters",