Prevent symbol set setting truncation

[fwdekker]

Fixes #382.

The issue was that I had added serializedSymbolSets and serializedActiveSymbolSets as variants of symbolSets and activeSymbolSets to ensure that emoji would not get lost when saving preferences. I then set the other variants of this field to be transient, but instead of making them abstractions over the serialized fields, I made them into separate fields. The result was that changes were stored only in the transient fields, but not the fields that were actually written to the preferences file.

[codecov]

Codecov Report

Merging #383 (0f60c36) into master (1434af2) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #383   +/-   ##
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  Coverage     80.78%   80.78%           
  Complexity      216      216           
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  Files            39       39           
  Lines          1452     1452           
  Branches        168      168           
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  Hits           1173     1173           
  Misses          239      239           
  Partials         40       40