fix: decoder integer divide by zero on invalid basetype

[muktihari]

When receiving bad encoded FIT file such as this bytes stream []byte("\x0e\x10^\x06\x17\b\x00\x00.FIT\xe3\xbb@0000\x060000000000000000000"), It has fieldDef with invalid BaseType causing our decoder to panic when doing this operation fieldDef.Size%fieldDef.BaseType.Size() since Size will return 0. To avoid this, let's make invalid size to be 255 just like all invalid values is the max size of the types. Any value modulo by 255 is always the value itself and any value divided by 255 will always zero.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (68c4c9a) to head (86e9a12).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #239   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           42        42           
  Lines         3602      3602           
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  Hits          3602      3602           

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