adopt reviewer suggestion

Signed-off-by: Andrew Fiddian-Green <software@whitebear.ch>

Author: andrewfg

itests/org.openhab.core.thing.tests/src/main/java/org/openhab/core/thing/link/ItemChannelLinkTaggingOSGiTest.java

@@ -136,13 +136,11 @@ public void assertTagsAreCorrect() {
 
         item = itemRegistry.get("Item_07");
         assertNotNull(item);
-        assertTrue(item.getTags().contains("Power"));
-        assertTrue(item.getTags().contains("Custom"));
+        assertEquals(Set.of("Power", "Custom"), item.getTags());
 
         item = itemRegistry.get("Item_08");
         assertNotNull(item);
-        assertTrue(item.getTags().contains("Power"));
-        assertTrue(item.getTags().contains("Custom"));
+        assertEquals(Set.of("Power", "Custom"), item.getTags());
 
         item = itemRegistry.get("Item_09");
         assertNotNull(item);