rgos: Also strip system uptime from module

[spike77453]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

Starting with RGOS/FSOS 12 show version also reports System uptime for any installed module, e.g.:

#show version 
System description      : FS Data Center Switch(N5860-48SC) By FS.COM Inc
System start time       : 2024-07-04 05:43:25
System uptime           : 0:06:26:14
System hardware version : 1.00
System software version : N5860_FSOS 12.5(1)B0506
System patch number     : NA
System serial number    : <redacted>
System boot version     : 1.3.36(Master) 1.3.36(Slave)
System rboot version    : 1.2.8
Module information:
  Slot 0 : N5860-48SC
    System uptime       : 0:06:26:14
    Hardware version    : 1.00
    Boot version        : 1.3.36(Master) 1.3.36(Slave)
    Rboot version       : 1.2.8
    Software version    : N5860_FSOS 12.5(1)B0506
    Serial number       : <redacted>

This change ensures all all lines starting with System uptime are rejected, no matter how many spaces (if any) there are between SOL and System uptime.