label.py: Fix typos deterime and appliees

[schwehr]

No description provided.

[codecov-io]

Codecov Report

Merging #192 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #192   +/-   ##
========================================
  Coverage    91.81%   91.81%           
========================================
  Files           27       27           
  Lines         3225     3225           
========================================
  Hits          2961     2961           
  Misses         264      264           

Impacted Files	Coverage Δ
pystac/extensions/label.py	86.20% <ø> (ø)

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