small edit to DivingHelmetItem and RemainingAirOverlay to fix compile errors

Author: ner24

src/main/java/com/simibubi/create/content/equipment/armor/DivingHelmetItem.java

@@ -121,7 +121,6 @@ public static void breatheUnderwater(LivingEntity entity) {
 		if (entity instanceof ServerPlayer sp)
 			AllAdvancements.DIVING_SUIT.awardTo(sp);
 
-		event.setCanBreathe(true);
-		event.setCanRefillAir(true);
+		entity.setAirSupply(entity.getMaxAirSupply());
 	}
 }

src/main/java/com/simibubi/create/content/equipment/armor/RemainingAirOverlay.java

@@ -11,7 +11,6 @@
 import net.minecraft.client.gui.GuiGraphics;
 import net.minecraft.client.player.LocalPlayer;
 import net.minecraft.network.chat.Component;
-import net.minecraft.tags.FluidTags;
 import net.minecraft.util.StringUtil;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.level.GameType;