avoid conditional variable declaration

[exercism-1]

perldoc perlsyn:

The behaviour of a my, state, or our modified with a statement modifier conditional or loop construct (for example, my $x if ... ) is undefined.

[codecov]

Codecov Report

Merging #99 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #99      +/-   ##
=========================================
+ Coverage    21.5%   21.5%   +<.01%     
=========================================
  Files          71      71              
  Lines       19913   19914       +1     
  Branches     5728    5728              
=========================================
+ Hits         4282    4283       +1     
  Misses      14922   14922              
  Partials      709     709

Impacted Files	Coverage Δ
lib/SQL/Translator/Producer/SQLite.pm	85.91% <100%> (+0.06%)	⬆️

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