fix(processor): fix theme.fontSize name error, close #808

[Hyphon]

This pr should fix issue #808.
The solution is change font size handler from amount to body, that makes the key from '1' (error) to 'title-1' (correct).

[codecov-commenter]

Codecov Report

Merging #823 (1f14f37) into main (cf3067b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #823   +/-   ##
=======================================
  Coverage   87.91%   87.91%           
=======================================
  Files          57       57           
  Lines        4882     4882           
  Branches     1038     1038           
=======================================
  Hits         4292     4292           
  Misses        323      323           
  Partials      267      267           

Impacted Files	Coverage Δ
src/lib/utilities/dynamic.ts	94.96% <100.00%> (ø)

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