[People Picker] change titleText to non-required property

[tsekityam]

Q	A
Bug fix?	[ ]
New feature?	[ ]
New sample?	[ ]
Related issues?	fixes #175

What's in this Pull Request?

Change titleText to non-required property, and hide the label if titleText is not provide.

[codecov-io]

Codecov Report

Merging #184 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #184   +/-   ##
=======================================
  Coverage   80.63%   80.63%           
=======================================
  Files          10       10           
  Lines         346      346           
  Branches       71       78    +7     
=======================================
  Hits          279      279           
  Misses         44       44           
  Partials       23       23

Impacted Files	Coverage Δ
src/loc/en-us.ts	100% <ø> (ø)	⬆️

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[estruyf]

Thank you @tsekityam for this change, your change is now merged and will be available in version 1.11.0.