test: adjust rounding for percentage to match expected output

Signed-off-by: ernolf <raphael.gradenwitz@googlemail.com>

Author: ernolf

tests/lib/LinuxTest.php

@@ -214,7 +214,7 @@ public function testGetDiskInfo(): void {
 		$used7 = 120591140;
 		$disk7->setUsed(117765);
 		$disk7->setAvailable(82737);
-		$disk7->setPercent('58.74%');
+		$disk7->setPercent('58.73%');
 		$disk7->setMount('/nextcloud/my.cloud.domain.xx');
 
 		$this->assertEquals([$disk1, $disk2, $disk3, $disk4, $disk5, $disk6, $disk7], $this->os->getDiskInfo());