fix(assets/animator): make sure that pauseAtEnd works as intended

Fixes #37

gamecore/modules/assets/animator.lua

@@ -60,7 +60,9 @@ function Animator:update(dt)
   if self.frameTimer > 1 then
     self.frameTimer = 0
     if self.frame == self.animationData.endAt then
-      self.frame = self.animationData.loop
+      if not (self.animationData.pauseAtEnd) then
+        self.frame = self.animationData.loop
+      end
     else
       self.frame = self.frame + 1
     end