fix OOK transmit - getting stuck after '12E' type

From https://github.com/z4ziggy/portapack-havoc/commit/395bc486f12b4303cadfc2fa59e9095a409aaaa8

firmware/application/apps/ui_encoders.hpp

@@ -55,7 +55,7 @@ private:
 	//uint8_t scan_count;
 	//double scan_progress;
 	//unsigned int scan_index;
-	int16_t waveform_buffer[512];
+	int16_t waveform_buffer[550];
 	const encoder_def_t * encoder_def { };
 	//uint8_t enc_type = 0;