fix(material/select): fix panel max height

fix panel max height so that panel does not get cutoff
at 200% zoom on 1024x768 pixel view

fixes b/286420340

src/material/select/select.scss

@@ -7,7 +7,7 @@
 
 $mat-select-arrow-size: 5px !default;
 $mat-select-arrow-margin: 4px !default;
-$mat-select-panel-max-height: 275px !default;
+$mat-select-panel-max-height: 11rem !default;
 $mat-select-placeholder-arrow-space: 2 *
   ($mat-select-arrow-size + $mat-select-arrow-margin);
 $leading-width: 12px !default;