Make parentContext optional in ModalOptions type

[sgarner]

This is a ...

• TypeScript definition update

What's the background?

In b8a0195 the parentContext field was added to ModalOptions.

Since upgrading to 1.4.11 (which is the first release containing this change), I receive build errors in my TypeScript project on code like the following:

this.$error({ content: 'Error message goes here.' });

It produces a build error because the parentContext property is now required:

Error:(62, 21) TS2345: Argument of type '{ content: string; }' is not assignable to parameter of type 'ModalOptions'.
  Property 'parentContext' is missing in type '{ content: string; }' but required in type 'ModalOptions'.

I don't think it was intentional that this property be required (if it was, that's a breaking change and should have been a major semver bump). So the type definition should make it optional.

[codecov]

Codecov Report

Merging #1784 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1784   +/-   ##
=======================================
  Coverage   88.06%   88.06%           
=======================================
  Files         157      157           
  Lines        5422     5422           
  Branches     1525     1525           
=======================================
  Hits         4775     4775           
  Misses        578      578           
  Partials       69       69

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[github-actions]

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