changes for email template modification on update

--- apps/dav/lib/CalDAV/Schedule/IMipPlugin.php	2022-04-27 09:57:34.955523100 +0530

+++ apps/dav/lib/CalDAV/Schedule/IMipPlugin_Modifiednew.php	2022-04-27 09:57:09.345523100 +0530

@@ -659,7 +659,7 @@

 										Message $iTipMessage, $lastOccurrence) {

 		$token = $this->createInvitationToken($iTipMessage, $lastOccurrence);

-		$template->addBodyButtonGroup(

+		$template->addBodyButtonGroupTentative(

 			$l10n->t('Accept'),

 			$this->urlGenerator->linkToRouteAbsolute('dav.invitation_response.accept', [

 				'token' => $token,

@@ -667,18 +667,11 @@

 			$l10n->t('Decline'),

 			$this->urlGenerator->linkToRouteAbsolute('dav.invitation_response.decline', [

 				'token' => $token,

-			])

+			]),

+			$l10n->t('Maybe'),

+			$this->urlGenerator->getAbsoluteUrl('apps/calendar/invitation/tentative/'.$token)

 		);

-		$moreOptionsURL = $this->urlGenerator->linkToRouteAbsolute('dav.invitation_response.options', [

-			'token' => $token,

-		]);

-		$html = vsprintf('<small><a href="%s">%s</a></small>', [

-			$moreOptionsURL, $l10n->t('More options …')

-		]);

-		$text = $l10n->t('More options at %s', [$moreOptionsURL]);

-

-		$template->addBodyText($html, $text);

 	}

 	/**

--- ./apps/dav/lib/CalDAV/Schedule/IMipPlugin.php	2022-07-07 09:56:28.335627600 +0530

+++ ./apps/dav/lib/CalDAV/Schedule/IMipPlugin-new.php	2022-07-07 09:45:48.035627600 +0530

@@ -151,15 +151,6 @@