fix(slider): handle touchcancel event (#17520)
fix(slider): handle touchcancel event (#17520)

Stops sliding on `touchcancel` events in the `mat-slider`, in addition to `touchend`.
josephperrott/material2,josephperrott/material2,DevVersion/material2,Jefiozie/material2,crisbeto/material2,andrewseguin/material2,mmalerba/material2,Jefiozie/material2,andrewseguin/material2,DevVersion/material2,DevVersion/material2,crisbeto/material2,angular/components,josephperrott/material2,angular/components,DevVersion/material2,mmalerba/material2,Jefiozie/material2,angular/components,DevVersion/material2,andrewseguin/material2,Jefiozie/material2,angular/components,josephperrott/material2,crisbeto/material2,andrewseguin/material2,mmalerba/material2,crisbeto/material2,andrewseguin/material2,josephperrott/material2,mmalerba/material2,Jefiozie/material2,mmalerba/material2