Remove Flutter bug workaround

[tomgilder]

No description provided.

[codecov]

Codecov Report

Merging #269 (1448b62) into main (f3dec24) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #269   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files          18       18           
  Lines        1010     1011    +1     
=======================================
+ Hits         1005     1006    +1     
  Misses          5        5           

Impacted Files	Coverage Δ
lib/src/pages/pages.dart	100.00% <ø> (ø)
lib/src/pages/transition_page.dart	100.00% <ø> (ø)
lib/routemaster.dart	99.52% <100.00%> (ø)
lib/src/not_found_page.dart	100.00% <100.00%> (ø)
lib/src/parser.dart	100.00% <100.00%> (ø)

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