Demo: Minor tweak to angled headers demo.

imgui_demo.cpp

@@ -5209,6 +5209,7 @@ static void ShowDemoWindowTables()
         ImGui::CheckboxFlags("_HighlightHoveredColumn", &table_flags, ImGuiTableFlags_HighlightHoveredColumn);
         ImGui::SetNextItemWidth(ImGui::GetFontSize() * 8);
         ImGui::SliderInt("Frozen columns", &frozen_cols, 0, 2);
+        ImGui::SetNextItemWidth(ImGui::GetFontSize() * 8);
         ImGui::SliderInt("Frozen rows", &frozen_rows, 0, 2);
 
         if (ImGui::BeginTable("table_angled_headers", columns_count, table_flags, ImVec2(0.0f, TEXT_BASE_HEIGHT * 12)))