Hide one of the input hints on note dialog

src/app/degree-planner/dialogs/notes-dialog/notes-dialog.component.html

@@ -30,10 +30,10 @@
             aria-label="Note input"
             placeholder="i.e. Studying abroad">
           </textarea>
-          <mat-hint align="start">
+          <mat-hint align="start" fxShow fxHide.xs="true">
            Note can be up to {{ MAX_LENGTH }} characters long
           </mat-hint>
-          <mat-hint align="end" *ngIf="form.value.textarea?.length > 0">
+          <mat-hint align="end">
             {{ form.value.textarea.length }} / {{ MAX_LENGTH }}
           </mat-hint>
         </mat-form-field>