Backends: GLFW: Fixed clipboard handler assertion when using GLFW <= 3.2.1 compiled with asserts enabled. (#8452)

Amend 8e4010479

imgui_internal.h

@@ -2940,7 +2940,7 @@ struct IMGUI_API ImGuiTableTempData
     ImGuiTableTempData()        { memset(this, 0, sizeof(*this)); LastTimeActive = -1.0f; }
 };
 
-// sizeof() ~ 12
+// sizeof() ~ 16
 struct ImGuiTableColumnSettings
 {
     float                   WidthOrWeight;