fix(template-webpack): only use node-loader if the .node files are in native_modules/

[malept]

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Summarize your changes:

Apparently the asset relocator loader generates "fake" .node files which are actually JS files that point toward the relocated native modules in native_modules/. Since they're not actually native code, we can't have node-loader load them. To fix this, adjust the default test for the node-loader to only pick up .node modules in a native_modules folder. (This can be adjusted as necessary by the Electron app author).

[codecov]

Codecov Report

Merging #2449 (9f2ef5a) into master (5047f5b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2449   +/-   ##
=======================================
  Coverage   75.35%   75.35%           
=======================================
  Files          91       91           
  Lines        2353     2353           
  Branches      440      440           
=======================================
  Hits         1773     1773           
  Misses        472      472           
  Partials      108      108           

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