fix: one overlay entry for selection menu

[Xazin]

Closes: #77

[codecov]

Codecov Report

Merging #82 (fc988f0) into main (0f303cb) will decrease coverage by 0.02%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
- Coverage   86.79%   86.77%   -0.02%     
==========================================
  Files         124      124              
  Lines        7322     7314       -8     
==========================================
- Hits         6355     6347       -8     
  Misses        967      967              

Impacted Files	Coverage Δ
lib/src/render/toolbar/toolbar_item.dart	93.60% <93.75%> (-0.17%)	⬇️

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