BF: DlgFromDict was erroneously adding keys when given "order" or "fixed"

[TEParsons]

Fixes #6808

The cause of the bug was that I'd tried to use pipe syntax where possible to avoid doing the same thing twice in different places, but this meant adding characters to the dict keys in the case of order and fixed when we didn't need to.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.61%. Comparing base (c9c5010) to head (60088ec).
Report is 6 commits behind head on release.

Additional details and impacted files

@@             Coverage Diff             @@
##           release    #6818      +/-   ##
===========================================
+ Coverage    49.04%   49.61%   +0.56%     
===========================================
  Files          332      332              
  Lines        61155    61167      +12     
===========================================
+ Hits         29996    30348     +352     
+ Misses       31159    30819     -340     

Components	Coverage Δ
app	∅ <ø> (∅)
boilerplate	∅ <ø> (∅)
library	∅ <ø> (∅)
vm-safe library	∅ <ø> (∅)