compiler: fix import alias handling

[fyrchik]

Close #1802 .

[codecov]

Codecov Report

Merging #1808 (8f8c7d2) into master (f454112) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1808      +/-   ##
==========================================
+ Coverage   83.57%   83.66%   +0.09%     
==========================================
  Files         271      271              
  Lines       22077    22083       +6     
==========================================
+ Hits        18450    18475      +25     
+ Misses       2501     2479      -22     
- Partials     1126     1129       +3     

Impacted Files	Coverage Δ
pkg/compiler/analysis.go	96.66% <100.00%> (+0.06%)	⬆️
pkg/compiler/codegen.go	90.69% <100.00%> (+0.02%)	⬆️
pkg/network/server.go	72.91% <0.00%> (+0.15%)	⬆️
pkg/services/oracle/request.go	62.29% <0.00%> (+6.55%)	⬆️
pkg/services/oracle/oracle.go	90.58% <0.00%> (+11.76%)	⬆️

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