Fix statements inside IF only if the END is missing

[bhirsz]

Fixes #226

[codecov-commenter]

Codecov Report

Merging #229 (3be1fb7) into main (a1652d1) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
+ Coverage   96.18%   96.42%   +0.23%     
==========================================
  Files          31       31              
  Lines        1811     1819       +8     
==========================================
+ Hits         1742     1754      +12     
+ Misses         69       65       -4     

Impacted Files	Coverage Δ
robotidy/transformers/AddMissingEnd.py	96.87% <100.00%> (+9.37%)	⬆️
robotidy/files.py	94.50% <0.00%> (-1.89%)	⬇️

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