XML output returns memory related values in kilo-bytes and not bytes

[j-ed]

Expected behavior

If you use the external monitor API, all values should be returned in bytes.

Current behavior

If you use the external monitor API, all memory related values are returned in kilo-bytes instead
of bytes, because the output of /proc/meminfo is used to get the information, which is by default
returning values in kB. Compared to the freespace information this inconsistent.

# cat /proc/meminfo | grep "^Mem"
MemTotal:        8183664 kB
MemFree:          339332 kB
MemAvailable:    5807060 kB

XML output:

Environment

Server Configuration

OS: Linux 3.16.62
Web server: Apache2 2.4.37
Database: MariaDB 10.2.21
PHP version: 7.2.14
Nextcloud version: 15.0.4
Serverinfo app version: 1.5.0

Client Configuration

Browser: Mozilla Firefox 65.0.1
Operating system: Windows 10