fix(material-experimental/mdc-select): target correct element with ty…

…pography (#24258)

Targets the MDC select host node instead of just the value with the typography mixin. The previous approach would've broken any overrides and it didn't cover the select placeholder.

(cherry picked from commit f5d74da)

src/material-experimental/mdc-select/_select-theme.scss

@@ -71,7 +71,7 @@
       @include mdc-list.list-base(mdc-helpers.$mat-typography-styles-query);
     }
 
-    .mat-mdc-select-value {
+    .mat-mdc-select {
       @include mdc-typography.typography(body1, $query: mdc-helpers.$mat-typography-styles-query);
     }
   }