vmstat: fix meminfo unit

[Bluemangoo]

• fix Fix wrong unit of meminfo parser #667

Use a simple but not very graceful way to fix the issue.

See more in the issue.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.16%. Comparing base (537edf5) to head (251f9b3).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/uu/vmstat/src/parser.rs	0.00%	24 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #668   +/-   ##
=======================================
  Coverage   19.16%   19.16%           
=======================================
  Files          68       68           
  Lines       10147    10147           
  Branches      545      545           
=======================================
  Hits         1945     1945           
  Misses       8202     8202           

Flag	Coverage Δ
macos_latest	6.74% <ø> (ø)
ubuntu_latest	19.52% <0.00%> (ø)
windows_latest	0.02% <ø> (ø)

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[Franklin-Qi]

LGTM 💯

[robjtede]

given the output of meminfo is non-standard, this fix lgtm

[Krysztal112233]

oops. historical echoes from the kernel XD.

@Bluemangoo could you please also add a documentation link to this issue? bytesize-rs/bytesize#157