Fixed typo in getstorybook project type detection

[shilman]

Issue: #1193

What I did

Fix typo

How to test

Did not test. Run getstorybook in a project with no devDependencies and it will break, as in the issue.

[codecov]

Codecov Report

Merging #1195 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #1195   +/-   ##
=======================================
  Coverage   13.31%   13.31%           
=======================================
  Files         199      199           
  Lines        4589     4589           
  Branches      526      603   +77     
=======================================
  Hits          611      611           
+ Misses       3518     3456   -62     
- Partials      460      522   +62

Impacted Files	Coverage Δ
lib/cli/lib/detect.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/types/Select.js	7.14% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
app/react/src/client/preview/error_display.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/filters.js	41.66% <0%> (ø)	⬆️
app/react/src/client/preview/render.js	0% <0%> (ø)	⬆️
app/react/src/server/babel_config.js	44.82% <0%> (ø)	⬆️
app/react-native/src/bin/storybook-build.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	49.42% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
... and 25 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1a247cd...0eba277. Read the comment docs.