fix: fix moving to variable false positives

[incendial]

Please write a short comment explaining your change (or "none" for internal only changes)

Fixes newly reported false positives for prefer-moving-to-variable.

[codecov[bot]]

Codecov Report

Merging #1186 (2bdc27e) into master (d19a1e4) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1186      +/-   ##
==========================================
+ Coverage   86.12%   86.16%   +0.04%     
==========================================
  Files         359      359              
  Lines        8085     8112      +27     
==========================================
+ Hits         6963     6990      +27     
  Misses       1122     1122              

Impacted Files	Coverage Δ
.../rules_list/prefer_moving_to_variable/visitor.dart	100.00% <100.00%> (ø)

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