CollapsingHeader: Minor fix to align right side of frames (which is extruded past the Work/Contents rect) with clipping rectangle.

imgui_widgets.cpp

@@ -5143,7 +5143,7 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
     {
         // Framed header expand a little outside the default padding
         frame_bb.Min.x -= (float)(int)(window->WindowPadding.x * 0.5f - 1.0f);
-        frame_bb.Max.x += (float)(int)(window->WindowPadding.x * 0.5f - 1.0f);
+        frame_bb.Max.x += (float)(int)(window->WindowPadding.x * 0.5f);
     }
 
     const float text_offset_x = (g.FontSize + (display_frame ? padding.x*3 : padding.x*2));   // Collapser arrow width + Spacing