fix(playground): reset state on query change

[vasilev-alex]

No description provided.

[codecov]

Codecov Report

Merging #3321 (10e86be) into master (85cebc2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3321   +/-   ##
=======================================
  Coverage   59.01%   59.01%           
=======================================
  Files         124      124           
  Lines        9750     9750           
  Branches     2121     2121           
=======================================
  Hits         5754     5754           
  Misses       3714     3714           
  Partials      282      282           

Impacted Files	Coverage Δ
...es/cubejs-schema-compiler/src/adapter/BaseQuery.js	62.44% <ø> (ø)

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