Remove unused webpack alias config

[georgehrke]

Also adds symlink: false, which is part of our standard conf: https://github.com/nextcloud/webpack-vue-config/blob/master/webpack.js#L65

[codecov]

Codecov Report

Merging #2494 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2494   +/-   ##
=========================================
  Coverage     30.47%   30.47%           
  Complexity      103      103           
=========================================
  Files           146      146           
  Lines          5365     5365           
  Branches        802      802           
=========================================
  Hits           1635     1635           
  Misses         3730     3730           

Flag	Coverage Δ	Complexity Δ
#javascript	25.40% <ø> (ø)	0.00 <ø> (ø)
#php	94.41% <ø> (ø)	103.00 <ø> (ø)

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