Modify -form of pattern-map-schema

[skydread1]

Closes #65

Update the -form method of pattern-map-schema so it does not add a extra key pattern-map.

This allows us to call m/form on a pattern-map-schema and get the same schema as a normal map.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e257f76) 94.59% compared to head (52049f8) 94.59%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #66   +/-   ##
=======================================
  Coverage   94.59%   94.59%           
=======================================
  Files           7        7           
  Lines         444      444           
  Branches       10       10           
=======================================
  Hits          420      420           
  Misses         14       14           
  Partials       10       10           

Impacted Files	Coverage Δ
src/sg/flybot/pullable/schema.cljc	92.90% <100.00%> (ø)

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