[Upgrade] Fix the inside_kernel to fit Taichi AST refactor

[erizmr]

Fix the ti.inside_kernel to fit Taichi AST refactor.

[codecov]

Codecov Report

Merging #17 (abd92bb) into master (991457d) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   48.87%   48.87%           
=======================================
  Files          18       18           
  Lines         890      890           
  Branches      107      114    +7     
=======================================
  Hits          435      435           
  Misses        448      448           
  Partials        7        7           

Impacted Files	Coverage Δ
taichi_glsl/gui.py	23.34% <0.00%> (ø)
taichi_glsl/vector.py	63.46% <0.00%> (ø)

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