fix wrong escaping of backslash in class-names when updating cronjobs_run table; add missing validateFormField-method for type 'image' (needs to be present but image-validation is handled elsewhere

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

install/updates/froxlor/update_2.1.inc.php

@@ -67,15 +67,18 @@ if (Froxlor::isFroxlorVersion('2.0.24')) {
 	}
 
 	Update::showUpdateStep("Adjusting cronjobs");
-	Database::query("
+	$cfupd_stmt = Database::prepare("
         UPDATE `" . TABLE_PANEL_CRONRUNS . "` SET
         `module`= 'froxlor/export',
         `cronfile` = 'export',
-        `cronclass` = '\\Froxlor\\Cron\\System\\ExportCron',
+        `cronclass` = :cc,
         `interval` = '1 HOUR',
         `desc_lng_key` = 'cron_export'
         WHERE `module` = 'froxlor/backup'
     ");
+	Database::pexecute($cfupd_stmt, [
+		'cc' => '\\Froxlor\\Cron\\System\\ExportCron'
+	]);
 	Update::lastStepStatus(0);
 
 	Update::showUpdateStep("Adjusting system for data-export function");

lib/Froxlor/Validate/Form/Data.php

@@ -265,4 +265,10 @@ class Data
 
 		return $returnvalue;
 	}
+
+	public static function validateFormFieldImage($fieldname, $fielddata, $newfieldvalue)
+	{
+		// validation is handled in \Froxlor\Settings\Store::storeSettingImage()
+		return true;
+	}
 }