Misc: rename extraneous parenthesizes from return statements.

imgui_widgets.cpp

@@ -1834,7 +1834,7 @@ static int IMGUI_CDECL ShrinkWidthItemComparer(const void* lhs, const void* rhs)
     const ImGuiShrinkWidthItem* b = (const ImGuiShrinkWidthItem*)rhs;
     if (int d = (int)(b->Width - a->Width))
         return d;
-    return (b->Index - a->Index);
+    return b->Index - a->Index;
 }
 
 // Shrink excess width from a set of item, by removing width from the larger items first.