build: fix "test all" script running incorrectly (#19261)
build: fix "test all" script running incorrectly (#19261)

Currently `yarn test all` runs tests for the wrong browsers as we
incorrectly filter out the desired browser.
josephperrott/material2,Jefiozie/material2,mmalerba/material2,andrewseguin/material2,andrewseguin/material2,angular/components,angular/components,josephperrott/material2,Jefiozie/material2,josephperrott/material2,mmalerba/material2,DevVersion/material2,DevVersion/material2,crisbeto/material2,crisbeto/material2,DevVersion/material2,mmalerba/material2,Jefiozie/material2,Jefiozie/material2,crisbeto/material2,angular/components,andrewseguin/material2,andrewseguin/material2,DevVersion/material2,mmalerba/material2,angular/components,Jefiozie/material2,mmalerba/material2,andrewseguin/material2,DevVersion/material2,josephperrott/material2,crisbeto/material2,josephperrott/material2