Disable default activity email for incoming shares

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

apps/files_sharing/lib/Activity/Settings/RemoteShare.php

@@ -92,7 +92,7 @@ class RemoteShare implements ISetting {
 	 * @since 11.0.0
 	 */
 	public function isDefaultEnabledMail() {
-		return true;
+		return false;
 	}
 }
 

apps/files_sharing/lib/Activity/Settings/Shared.php

@@ -92,7 +92,7 @@ class Shared implements ISetting {
 	 * @since 11.0.0
 	 */
 	public function isDefaultEnabledMail() {
-		return true;
+		return false;
 	}
 }