Update and Fix Slack Example onLongPress()

[thedmeyer]

This PR fixes the Slack Example by updating onLongPress() in SlackBubble.js. The prior version was missing this.props.currentMessage for custom ActionSheets.

[codecov]

Codecov Report

Merging #1143 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1143   +/-   ##
=======================================
  Coverage   41.03%   41.03%           
=======================================
  Files          21       21           
  Lines         524      524           
  Branches      117      117           
=======================================
  Hits          215      215           
  Misses        233      233           
  Partials       76       76

---

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[codecov]

Codecov Report

Merging #1143 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1143   +/-   ##
=======================================
  Coverage   41.03%   41.03%           
=======================================
  Files          21       21           
  Lines         524      524           
  Branches      117      117           
=======================================
  Hits          215      215           
  Misses        233      233           
  Partials       76       76

---

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 5c0b71a...98038cc. Read the comment docs.