Process: Display single digit precision for CPU% greater than 99.9%

Since commit edf319e[1], we're dynamically adjusting column width of
"CPU%", showing single digit precision also for values greater than
"99.9%" makes "CPU%" column consistent with all other values.

[1]: edf319e53d1fb77546505e238d75160a3febe56e

Change "Process_printPercentage()" function's logic to always display
value (i.e. "val") with single precision. Except when value is greater
than "99.9%" for columns like "MEM%", whose width is fixed to "4" and
value cannot go beyond "100%".

Credits: @Explorer09, thanks for the patch[2] to fix title alignment
         issue.

[2]: https://github.com/htop-dev/htop/pull/959#issuecomment-1092480951

Closes: #957

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