Update client-side max envelope size to 256KB to match server.

app/src/main/java/org/thoughtcrime/securesms/dependencies/ApplicationDependencyProvider.java

@@ -127,7 +127,7 @@ public class ApplicationDependencyProvider implements ApplicationDependencies.Pr
                                             Optional.of(new SecurityEventListener(context)),
                                             provideClientZkOperations().getProfileOperations(),
                                             SignalExecutors.newCachedBoundedExecutor("signal-messages", 1, 16, 30),
-                                            ByteUnit.KILOBYTES.toBytes(512),
+                                            ByteUnit.KILOBYTES.toBytes(256),
                                             FeatureFlags.okHttpAutomaticRetry());
   }