fix(material/paginator): items per page form field touch target issue

items per page form field touch target does not have sufficient touch target
size (48 x 48)

fixes b/202731532

Author: DBowen33

src/material/paginator/paginator.scss

@@ -47,7 +47,7 @@ $button-icon-size: 28px;
   .mat-mdc-select {
     // The smaller font size inherited from the paginator throws off the centering of the select
     // inside the form field. This `line-height` helps to center it relative to the other text.
-    line-height: 1.5;
+    line-height: 2;
   }
 }