fix: Fix default values for ini var in lib/base.php

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

lib/base.php

@@ -656,11 +656,11 @@ class OC {
 		//this doesn´t work always depending on the webserver and php configuration.
 		//Let´s try to overwrite some defaults if they are smaller than 1 hour
 
-		if (intval(@ini_get('max_execution_time') ?? 0) < 3600) {
+		if (intval(@ini_get('max_execution_time') ?: 0) < 3600) {
 			@ini_set('max_execution_time', strval(3600));
 		}
 
-		if (intval(@ini_get('max_input_time') ?? 0) < 3600) {
+		if (intval(@ini_get('max_input_time') ?: 0) < 3600) {
 			@ini_set('max_input_time', strval(3600));
 		}