Fix erase and noErase in webgl

Author: acamposuribe

src/webgl/p5.RendererGL.js

@@ -1198,7 +1198,7 @@ p5.RendererGL = class RendererGL extends p5.Renderer {
       // It's necessary to restore post-erase state. Needs rework
       let temp = this.curBlendMode;
       this.blendMode(this._cachedBlendMode);
-      this._cachedBlendMode = temp; // If we don't do this, appleBlendMode() returns null
+      this._cachedBlendMode = temp; // If we don't do this, applyBlendMode() returns null
       this._isErasing = false;
       this._applyBlendMode(); // This sets _cachedBlendMode back to the original blendmode
     }