remove invalid nc12 tags since the methods are used as fallback in case of errors and don't link to a server version

Update server versions according to E-o-L schedule

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/java/com/owncloud/android/MainApp.java

@@ -120,7 +120,7 @@ import static com.owncloud.android.ui.activity.ContactsPreferenceActivity.PREFER
  */
 public class MainApp extends MultiDexApplication implements HasAndroidInjector {
 
-    public static final OwnCloudVersion OUTDATED_SERVER_VERSION = OwnCloudVersion.nextcloud_17;
+    public static final OwnCloudVersion OUTDATED_SERVER_VERSION = OwnCloudVersion.nextcloud_18;
     public static final OwnCloudVersion MINIMUM_SUPPORTED_SERVER_VERSION = OwnCloudVersion.nextcloud_16;
 
     private static final String TAG = MainApp.class.getSimpleName();

src/main/java/com/owncloud/android/ui/TextDrawable.java

@@ -100,7 +100,6 @@ public class TextDrawable extends Drawable {
      * @return the avatar as a TextDrawable
      */
     @NonNull
-    @NextcloudServer(max = 12)
     public static TextDrawable createAvatar(Account account, float radiusInDp) {
         String username = UserAccountManager.getDisplayName(account);
         return createNamedAvatar(username, radiusInDp);
@@ -115,7 +114,6 @@ public class TextDrawable extends Drawable {
      * @return the avatar as a TextDrawable
      */
     @NonNull
-    @NextcloudServer(max = 12)
     public static TextDrawable createAvatarByUserId(String userId, float radiusInDp) {
         return createNamedAvatar(userId, radiusInDp);
     }