fix: source map warning seen during build

[bradenmacdonald]

Description

We include a file (react-ranger.js) that is already sort of transpiled, minified, etc. It references a source map that doesn't exist, resulting in this warning seen during npm run build:

WARNING in ./src/grading-settings/grading-scale/react-ranger.js
Module Warning (from ./node_modules/source-map-loader/dist/cjs.js):
Failed to parse source map from 'frontend-app-course-authoring/src/grading-settings/grading-scale/react-ranger.mjs.map' file: Error: ENOENT: no such file or directory, open 'frontend-app-course-authoring/src/grading-settings/grading-scale/react-ranger.mjs.map'
 @ ./src/grading-settings/grading-scale/GradingScale.jsx 11:0-43 152:6-15
 @ ./src/grading-settings/GradingSettings.jsx 21:0-56 160:46-58
 @ ./src/grading-settings/index.js 2:0-63 2:0-63
 @ ./src/CourseAuthoringRoutes.jsx 15:0-53 129:38-53
 @ ./src/index.jsx 12:0-60 55:33-54

This is not a big problem, but it's nice to get rid of these sort of warnings if we can.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.68%. Comparing base (71fcf9f) to head (1d51339).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1150   +/-   ##
=======================================
  Coverage   92.68%   92.68%           
=======================================
  Files         693      693           
  Lines       12347    12347           
  Branches     2661     2694   +33     
=======================================
  Hits        11444    11444           
  Misses        872      872           
  Partials       31       31           

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