Custom Zeta Blur fix

adds missing variable check that enables the use of a custom zeta_blur.png

Export_Code/gml_Object_oMZeta_Alarm_1.gml

@@ -1,6 +1,6 @@
 var trail;
 trail = instance_create(x, y, oFXTrail)
-trail.sprite_index = sMZetaBlur
+trail.sprite_index = ZetaBlurSprite
 trail.image_alpha = 1
 trail.white = 0
 trail.fadespeed = 0.15

Export_Code/gml_Object_oMZeta_Create_0.gml

@@ -95,3 +95,7 @@ myposx = floor((x / 320))
 myposy = floor(((y - 8) / 240))
 mapposx = (myposx + global.mapoffsetx)
 mapposy = (myposy + global.mapoffsety)
+if (oControl.ZetaBlur != -1) && (oControl.mod_fusion == 1)
+    ZetaBlurSprite = oControl.ZetaBlur
+else
+    ZetaBlurSprite = sMZetaBlur

Export_Code/gml_Object_oMZeta_Other_20.gml

@@ -18,6 +18,6 @@ if surface_exists(surf)
             draw_sprite_ext(fleg_spr, fleg_frame, body_x, surf_y, facing, 1, 0, -1, 1)
     }
     else
-        draw_sprite_ext(sMZetaBlur, -1, body_x, body_y, facing, 1, 0, -1, 1)
+        draw_sprite_ext(ZetaBlurSprite, -1, body_x, body_y, facing, 1, 0, -1, 1)
     surface_reset_target()
 }