chatfilter: fix matching lt/gt

These are encoded as <lt> and <gt> and so require the patterns to match those, which is unintuitive

runelite-client/src/main/java/net/runelite/client/plugins/chatfilter/ChatFilterPlugin.java

@@ -320,7 +320,9 @@ public class ChatFilterPlugin extends Plugin
 	String censorMessage(final String username, final String message)
 	{
 		String strippedMessage = jagexPrintableCharMatcher.retainFrom(message)
-			.replace('\u00A0', ' ');
+			.replace('\u00A0', ' ')
+			.replaceAll("<lt>", "<")
+			.replaceAll("<gt>", ">");
 		String strippedAccents = stripAccents(strippedMessage);
 		assert strippedMessage.length() == strippedAccents.length();
 

runelite-client/src/test/java/net/runelite/client/plugins/chatfilter/ChatFilterPluginTest.java

@@ -453,4 +453,15 @@ public class ChatFilterPluginTest
 		chatFilterPlugin.onScriptCallbackEvent(event);
 		assertEquals(1, client.getIntStack()[client.getIntStackSize() - 3]); // not filtered
 	}
+
+	@Test
+	public void testLtGt()
+	{
+		when(chatFilterConfig.filteredWords()).thenReturn("f<ilte>r");
+
+		chatFilterPlugin.updateFilteredPatterns();
+
+		String message = chatFilterPlugin.censorMessage("Adam", "start f<lt>ilte<gt>r end");
+		assertEquals("start ******** end", message);
+	}
 }