Fixed pvs-studio warning.

imgui_widgets.cpp

@@ -6745,7 +6745,7 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
     }
 
     const bool disabled_item = (flags & ImGuiSelectableFlags_Disabled) != 0;
-    const bool item_add = ItemAdd(bb, id, NULL, disabled_item ? (ImGuiItemFlags_)ImGuiItemFlags_Disabled : ImGuiItemFlags_None);
+    const bool item_add = ItemAdd(bb, id, NULL, disabled_item ? (ImGuiItemFlags)ImGuiItemFlags_Disabled : ImGuiItemFlags_None);
     if (span_all_columns)
     {
         window->ClipRect.Min.x = backup_clip_rect_min_x;