undo change that caused darkened color for legacy form field

Author: mmalerba

src/lib/form-field/_form-field-legacy-theme.scss

@@ -10,9 +10,18 @@
   $foreground: map-get($theme, foreground);
   $is-dark-theme: map-get($theme, is-dark);
 
+  $label-color: mat-color($foreground, secondary-text);
   $underline-color: mat-color($foreground, divider, if($is-dark-theme, 0.7, 0.42));
 
   .mat-form-field-appearance-legacy {
+    .mat-form-field-label {
+      color: $label-color;
+    }
+
+    .mat-hint {
+      color: $label-color;
+    }
+
     .mat-form-field-underline {
       background-color: $underline-color;
     }

src/lib/form-field/_form-field-theme.scss

@@ -37,7 +37,7 @@
     color: $label-color;
   }
 
-  .mat-focused .mat-form-field-label {
+  .mat-form-field.mat-focused .mat-form-field-label {
     color: $focused-label-color;
 
     &.mat-accent {