fix: remove Nextcloud contacts app direct dependency on nextcloud plugin

NC contacts app is just frontend for contacts & addressbook of NC
server. Nextcloud plugin `auto save recipients on addressbook` feature used to depends on contacts app directly. This commit update that logic.

plugins/nextcloud/NextcloudAddressBook.php

@@ -62,7 +62,8 @@ private function GetSavedAddressBookKey() : string
 	public function IsSupported() : bool
 	{
 		// Maybe just return true, contacts app is just a frontend
-		return \OC::$server->getAppManager()->isEnabledForUser('contacts');
+		// return \OC::$server->getAppManager()->isEnabledForUser('contacts');
+		return true;
 	}
 
 	public function SetEmail(string $sEmail) : bool

plugins/nextcloud/README.md

@@ -2,7 +2,7 @@
 
 ## Nextcloud Addressbook for recipients
 
-This plugin can let user to choose which nextcloud addressbook to use save recipients. This is opt-in feature (enabled by admin). After admin enable this, user will find a dropdown in his/her SnappyMail's `Contacts` section, containing all his/her addressbook.
+ This plugin can let user to choose which nextcloud addressbook to use save recipients. This is opt-in feature (enabled by admin). After admin enable this, user will find a dropdown in his/her SnappyMail's `Contacts` section, containing all his/her addressbook. It works better with [Nextcloud Contacts App](https://github.com/nextcloud/contacts/)
 
 ### Admin settings