fixed character editor anim bug that happened when adding a new anim (#757)

* fixed character editor anim bug

* forgor to change one variable

Author: KolzeYT

source/funkin/editors/character/CharacterAnimButton.hx

@@ -258,6 +258,10 @@ class CharacterAnimButton extends UIButton {
 		parent.displayAnimsFramesList.remove(anim);
 		parent.displayAnimsFramesList.set(newName, displayFrame);
 
+		var animButton = parent.animButtons.get(this.anim);
+		parent.animButtons.remove(this.anim);
+		parent.animButtons.set(newName, animButton);
+
 		this.anim = newName;
 		nameTextBox.label.text = newName;
 		updateText();