Fix dialog spacing

[sundaram123krishnan]

Tried reducing the spacing between the 2 buttons of the warning modal

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 29%. Comparing base (a676ac1) to head (23da56b).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
src/piggui.rs	0%	1 Missing ⚠️
src/views/modal_handler.rs	0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##           master   #488   +/-   ##
=====================================
+ Coverage      29%    29%   +1%     
=====================================
  Files          43     43           
  Lines        5142   5138    -4     
=====================================
  Hits         1488   1488           
+ Misses       3654   3650    -4     

Flag	Coverage Δ
unittests	29% <0%> (+1%)	⬆️

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[andrewdavidmackenzie]

This fixes the problem.
I'd prefer a more flexible way to layout dialogs (e.g. left justify left botton, right justify right button, minumum space between them, and the overall width adjusts so they fit without text wrapping) but I guess we'll leave that as a future exercise.