fix(material/select): remove internal-only M2 styles

Author: Andrew Seguin

src/material/select/_m2-select.scss

@@ -19,16 +19,9 @@ $prefix: (mat, select);
 // Tokens that can be configured through Angular Material's color theming API.
 @function get-color-tokens($theme, $palette-name: primary) {
   $is-dark: inspection.get-theme-type($theme) == dark;
-
-  // Ideally we would derive all values directly from the theme, but it causes a lot of regressions
-  // internally. For now we fall back to the old hardcoded behavior only for internal apps.
-  $on-surface: if($is-dark, #fff, #000);
-  $text-color-base: if(m2-utils.$private-is-internal-build, $on-surface,
-    inspection.get-theme-color($theme, foreground, text, 1));
-  $disabled-text-color-base: if(m2-utils.$private-is-internal-build, $on-surface,
-    inspection.get-theme-color($theme, foreground, disabled-text, 1));
-  $icon-color-base: if(m2-utils.$private-is-internal-build, $on-surface,
-    inspection.get-theme-color($theme, foreground, divider, 1));
+  $text-color-base: inspection.get-theme-color($theme, foreground, text, 1);
+  $disabled-text-color-base: inspection.get-theme-color($theme, foreground, disabled-text, 1);
+  $icon-color-base: inspection.get-theme-color($theme, foreground, divider, 1);
 
   @return (
     panel-background-color: inspection.get-theme-color($theme, background, card),