Cleanup: remove redundant braces from assert & raise

autopep8 v1.7 added a space after assert & raise,
remove the braces as they aren't needed.

source/blender/datatoc/datatoc_icon.py

@@ -75,8 +75,8 @@ def icon_merge(file_src, pixels_canvas, canvas_w, canvas_h):
      orig_x, orig_y,
      w_canvas_test, h_canvas_test) = head
 
-    assert(w_canvas_test == canvas_w)
-    assert(h_canvas_test == canvas_h)
+    assert w_canvas_test == canvas_w
+    assert h_canvas_test == canvas_h
 
     for x in range(icon_w):
         for y in range(icon_h):