Pebble: always use 2.x notification on FW 2.x except for K9

FW 2.x notifications enables the "dismiss all" action, but for K9 we would loose
the mail icon. So K9 still needs the force option.

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/pebble/PebbleProtocol.java

@@ -268,7 +268,7 @@ public class PebbleProtocol extends GBDeviceProtocol {
             // 3.x notification
             String[] parts = {title, subtitle, body};
             return encodeBlobdbNotification((int) (ts & 0xffffffff), parts);
-        } else if (mForceProtocol) {
+        } else if (mForceProtocol || type != NOTIFICATION_EMAIL) {
             // 2.x notification
             return encodeExtensibleNotification(id, (int) (ts & 0xffffffff), title, subtitle, body, type);
         } else {