defmt-rtt: Rename Channel to Self in impl Channel

firmware/defmt-rtt/src/channel.rs

@@ -27,8 +27,8 @@ impl Channel {
         // the host-connection-status is only modified after RAM initialization while the device is
         // halted, so we only need to check it once before the write-loop
         let write = match self.host_is_connected() {
-            true => Channel::blocking_write,
-            false => Channel::nonblocking_write,
+            true => Self::blocking_write,
+            false => Self::nonblocking_write,
         };
 
         while !bytes.is_empty() {