fix(sources): discovery-154, activate scans button

[cdcabrera]

What's included

• fix(sources): discovery-154, activate scans button

Notes

• makes it so 2 or more selections activate the scan button in the upper right toolbar, currently it's set for 1 or more
• makes it consistent with the merge reports dialog on scans, and the credentials toolbar delete button

How to test

Local run check

1. update the NPM packages with $ yarn
2. $ yarn start:stage
3. navigate to sources and confirm it now takes 2 or more selections to activate the toolbar scans button

Example

Updates issue/story

DISCOVERY-154

[codecov-commenter]

Codecov Report

Merging #166 (926cadd) into dev (00a4f97) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##              dev     #166   +/-   ##
=======================================
  Coverage   80.36%   80.36%           
=======================================
  Files         108      108           
  Lines        3468     3468           
  Branches     1135     1135           
=======================================
  Hits         2787     2787           
  Misses        600      600           
  Partials       81       81           

Impacted Files	Coverage Δ
src/components/sources/sources.js	77.77% <0.00%> (ø)

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