Fix Side Only Issues

src/main/java/kamkeel/npcs/network/packets/player/MailActionPacket.java

@@ -168,7 +168,6 @@ public class MailActionPacket extends AbstractPacket {
         }
 
         @Override
-        @SideOnly(Side.SERVER)
         protected void handleCompleteData(ByteBuf data, EntityPlayer player) throws IOException {
             if (!(player instanceof EntityPlayerMP))
                 return;

src/main/java/kamkeel/npcs/network/packets/request/feather/DimensionTeleportPacket.java

@@ -46,7 +46,6 @@ public final class DimensionTeleportPacket extends AbstractPacket {
         out.writeInt(dimensionID);
     }
 
-    @SideOnly(Side.SERVER)
     @Override
     public void receiveData(ByteBuf in, EntityPlayer player) throws IOException {
         if (!(player instanceof EntityPlayerMP))