fix: setMatrix() return this object

[Yaceee]

Typing fix for setMatrix() function (Issue #607)

• In src/image/utility/setMatrix.js, the function setMatrix() return the this object (similar to the setChannel() function).
• In src/image/utility/setMatrix.js, add the return type to the setMatrix() function documentation
• Adjust the type definition in index.d.ts

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (8700b25) 84.43% compared to head (f75299b) 84.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##           legacy     #621   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files         163      163           
  Lines        5697     5698    +1     
  Branches     1424     1424           
=======================================
+ Hits         4810     4811    +1     
  Misses        790      790           
  Partials       97       97           

Impacted Files	Coverage Δ
src/image/utility/setMatrix.js	85.71% <100.00%> (+1.09%)	⬆️

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[targos]

Thanks