[Catalog] Give enough space for 3 lines of text in the catalog description.
[Catalog] Give enough space for 3 lines of text in the catalog description.

Summary:
Prior to this CL, not rounding the height of the text view meant that when 3
lines were displayed, the text view was scrollable.

This is no longer the case after taking the ceil of the estimated height.

Closes https://github.com/google/material-components-ios/issues/320

Test Plan: Look at Catalog > Collections. The description shouldn't scroll within the page.

Reviewers: #mdc_ios_owners, featherless

Reviewed By: #mdc_ios_owners, featherless

Projects: #material_components_ios

Differential Revision: http://codereview.cc/D864

brianjmoore/material-components-ios,Eccelor/material-components-ios,brianjmoore/material-components-ios,Eccelor/material-components-ios,material-components/material-components-ios,chriscox/material-components-ios,samnm/material-components-ios,randallli/material-components-ios,chriscox/material-components-ios,randallli/material-components-ios,brianjmoore/material-components-ios,willlarche/material-components-ios,randallli/material-components-ios,brianjmoore/material-components-ios,willlarche/material-components-ios,chriscox/material-components-ios,samnm/material-components-ios,material-components/material-components-ios,samnm/material-components-ios,willlarche/material-components-ios,Eccelor/material-components-ios,sigito/material-components-ios,samnm/material-components-ios,sigito/material-components-ios,material-components/material-components-ios,chriscox/material-components-ios,sigito/material-components-ios,willlarche/material-components-ios,samnm/material-components-ios,Eccelor/material-components-ios,Eccelor/material-components-ios,brianjmoore/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,material-components/material-components-ios,randallli/material-components-ios,chriscox/material-components-ios,willlarche/material-components-ios,sigito/material-components-ios,material-components/material-components-ios,randallli/material-components-ios