Demo: Fix '= =' typo in text (#8836)

imgui_demo.cpp

@@ -2170,7 +2170,7 @@ static void DemoWindowWidgetsQueryingStatuses()
         );
         ImGui::BulletText(
             "with Hovering Delay or Stationary test:\n"
-            "IsItemHovered() = = %d\n"
+            "IsItemHovered() = %d\n"
             "IsItemHovered(_Stationary) = %d\n"
             "IsItemHovered(_DelayShort) = %d\n"
             "IsItemHovered(_DelayNormal) = %d\n"