Disable image attachments for remote contacts alpha.

briar-android/src/main/java/org/briarproject/briar/android/TestingConstants.java

@@ -34,7 +34,7 @@ public interface TestingConstants {
 	/**
 	 * Feature flag for enabling image attachments.
 	 */
-	boolean FEATURE_FLAG_IMAGE_ATTACHMENTS = IS_DEBUG_BUILD;
+	boolean FEATURE_FLAG_IMAGE_ATTACHMENTS = false;
 
 	/**
 	 * Feature flag for enabling adding contacts at a distance.