Modify test so that it only counts paint styles with MapWithAI in the title (name)

Signed-off-by: Taylor Smock <taylor.smock@kaart.com>

test/unit/org/openstreetmap/josm/plugins/mapwithai/backend/MapWithAIDataUtilsTest.java

@@ -140,11 +140,10 @@ public class MapWithAIDataUtilsTest {
         Awaitility.await().atMost(Durations.FIVE_SECONDS)
                 .until(() -> !MapWithAIDataUtils.checkIfMapWithAIPaintStyleExists());
         List<StyleSource> paintStyles = MapPaintStyles.getStyles().getStyleSources();
-        int initialSize = paintStyles.size();
         for (int i = 0; i < 10; i++) {
             MapWithAIDataUtils.addMapWithAIPaintStyles();
             paintStyles = MapPaintStyles.getStyles().getStyleSources();
-            assertEquals(initialSize + 1, paintStyles.size(),
+            assertEquals(1, paintStyles.stream().filter(s -> s.title.contains("MapWithAI")).count(),
                     "The paintstyle should have been added, but only one of it");
         }
     }