Avoid trailing spaces in Topbar

[codesoap]

There were trailing spaces in the topbar, when the width of the terminal was not evenly dividable by the amount of pieces in a line of the topbar.

Example (one can see trailing whitespaces at the end of the first line):

This fix was inspired by stackoverflow.com/questions/55465884. It works by giving the first pieces of the line one extra character of width, until the remainder xmax % pieces is "used up".

This is the result:

Something like this may also be useful for the songlist, but it didn't seem like I the exact same solution would work there, at first glance. Thus I'll leave this task open for now.

[codecov-io]

Codecov Report

Merging #124 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #124   +/-   ##
=======================================
  Coverage   51.73%   51.73%           
=======================================
  Files          53       53           
  Lines        1900     1900           
=======================================
  Hits          983      983           
  Misses        891      891           
  Partials       26       26

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[kimtore]

Thanks for addressing this issue. I'm going to merge this, however it would be nice if the start positions were pre-calculated on window resize or topbar reconfiguration, so that it doesn't have to be done in the inner loop.