絵文字が見つからないときのTextのstyleを修正

[poppingmoon]

カスタム絵文字の読み込み時にエラーが起きたときや、存在しないカスタム絵文字が参照されたときに表示される :name: のような文字がMfmTextに与えられたTextStyleに従っていなかったのを修正しました

[codecov-commenter]

Codecov Report

Merging #244 (f519c3a) into master (7b0e8b8) will increase coverage by 0.00%.
The diff coverage is 88.23%.

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@@           Coverage Diff           @@
##           master     #244   +/-   ##
=======================================
  Coverage   24.92%   24.93%           
=======================================
  Files         198      198           
  Lines        9010     9009    -1     
=======================================
  Hits         2246     2246           
+ Misses       6764     6763    -1     

Files Changed	Coverage Δ
lib/view/common/misskey_notes/mfm_text.dart	37.58% <ø> (ø)
lib/view/common/misskey_notes/custom_emoji.dart	87.50% <88.23%> (+1.78%)	⬆️

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[shiosyakeyakini-info]

マージしました！ありがとうございます！