feat(config): change reply keymap to align with official client

internal/config/config.toml

@@ -68,9 +68,9 @@ select_last = "Rune[G]"
 # Select the message reference (reply) of the selected channel.
 select_reply = "Rune[s]"
 # Reply to the selected message.
-reply = "Rune[r]"
+reply = "Rune[R]"
 # Reply (with mention) to the selected message.
-reply_mention = "Rune[R]"
+reply_mention = "Rune[r]"
 cancel = "Esc"
 edit = "Rune[e]"
 delete = "Rune[D]"