fix(drawer): initialize foundation if props.open updates

[moog16]

fixes #408

[googlebot]

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[codecov-io]

Codecov Report

Merging #427 into rc7.0 will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##            rc7.0     #427      +/-   ##
==========================================
+ Coverage   96.65%   96.67%   +0.01%     
==========================================
  Files          59       59              
  Lines        1975     1984       +9     
  Branches      232      234       +2     
==========================================
+ Hits         1909     1918       +9     
  Misses         66       66

Impacted Files	Coverage Δ
packages/drawer/index.js	97.64% <100%> (+0.27%)	⬆️

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[googlebot]

CLAs look good, thanks!

[bonniezhou]

Suggested change

	if ((changedToModal || changedToDismissible) && !this.foundation_) {
	if (!this.foundation_) {

If I'm understanding this right, it doesn't matter whether it was changed to modal/dismissible or if it was already modal/dismissible, but as long as it's modal/dismissible and doesn't have a foundation then we should initialize it, right?

[moog16]

Modal has a different foundation from dismissible. So actually this might be incorrect