Reset Ender Crystals on Dragon Spawn

Crystals can end up in a bad state in certain conditions which causes
an exception on the expected number of crystals going negative.

This ensures the crystals/pillars are in expected state when the dragon spawns.

See #3522

paper-server/patches/sources/net/minecraft/world/level/dimension/end/EndDragonFight.java.patch

@@ -32,7 +32,15 @@
                  this.dragonUUID = null;
              }
          }
-@@ -513,7 +519,7 @@
+@@ -469,6 +475,7 @@
+             entityenderdragon.moveTo((double) this.origin.getX(), (double) (128 + this.origin.getY()), (double) this.origin.getZ(), this.level.random.nextFloat() * 360.0F, 0.0F);
+             this.level.addFreshEntity(entityenderdragon);
+             this.dragonUUID = entityenderdragon.getUUID();
++            this.resetSpikeCrystals(); // Paper - Reset ender crystals on dragon spawn
+         }
+ 
+         return entityenderdragon;
+@@ -513,7 +520,7 @@
          return this.previouslyKilled;
      }
  
@@ -41,7 +49,7 @@
          if (this.dragonKilled && this.respawnStage == null) {
              BlockPos blockposition = this.portalLocation;
  
-@@ -540,19 +546,19 @@
+@@ -540,19 +547,19 @@
                  List<EndCrystal> list1 = this.level.getEntitiesOfClass(EndCrystal.class, new AABB(blockposition1.relative(enumdirection, 2)));
  
                  if (list1.isEmpty()) {
@@ -65,7 +73,7 @@
          if (this.dragonKilled && this.respawnStage == null) {
              for (BlockPattern.BlockPatternMatch shapedetector_shapedetectorcollection = this.findExitPortal(); shapedetector_shapedetectorcollection != null; shapedetector_shapedetectorcollection = this.findExitPortal()) {
                  for (int i = 0; i < this.exitPortalPattern.getWidth(); ++i) {
-@@ -571,9 +577,10 @@
+@@ -571,9 +578,10 @@
              this.respawnStage = DragonRespawnAnimation.START;
              this.respawnTime = 0;
              this.spawnExitPortal(false);