Remove src from indidivudal .npmignore files

[hswolff]

Fixes #2602

cc @Hypnosphi

[codecov]

Codecov Report

Merging #2677 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2677   +/-   ##
=======================================
  Coverage   34.35%   34.35%           
=======================================
  Files         389      389           
  Lines        8747     8747           
  Branches      904      910    +6     
=======================================
  Hits         3005     3005           
- Misses       5127     5136    +9     
+ Partials      615      606    -9

Impacted Files	Coverage Δ
...tive/src/preview/components/StoryListView/index.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/search_box.js	36.36% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/shortcuts_help.js	12.85% <0%> (ø)	⬆️
...tories_panel/stories_tree/tree_decorators_utils.js	45.23% <0%> (ø)	⬆️
...react-native/src/manager/components/PreviewHelp.js	0% <0%> (ø)	⬆️
addons/info/src/components/PropVal.js	82.82% <0%> (ø)	⬆️
lib/codemod/src/transforms/move-buildin-addons.js	46.87% <0%> (ø)	⬆️
...ents/stories_panel/stories_tree/tree_decorators.js	34.37% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/layout/usplit.js	38.7% <0%> (ø)	⬆️
...dons/actions/src/lib/types/object/getObjectName.js	62.5% <0%> (ø)	⬆️
... and 42 more

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[tmeasday]

LGTM

[ktj]

This fixes problems with storybook apps, but addons still cause this problem.