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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