MOBILE-4270 messages: Remove nonexistent contrast as ion toolbar color

src/addons/messages/pages/discussion/discussion.html

@@ -103,7 +103,7 @@
     </ion-fab>
 </ion-content>
 <ion-footer class="footer-adjustable" *ngIf="loaded && (!conversationId || conversation)">
-    <ion-toolbar [color]="footerType == 'message' ? 'contrast' : 'light'">
+    <ion-toolbar [color]="footerType == 'message' ? null : 'light'">
         <p *ngIf="footerType == 'unable'" class="ion-text-center ion-margin-horizontal">
             {{ 'addon.messages.unabletomessage' | translate }}
         </p>

src/addons/mod/chat/pages/chat/chat.html

@@ -93,7 +93,7 @@
     </core-loading>
 </ion-content>
 <ion-footer class="footer-adjustable">
-    <ion-toolbar [color]="isOnline && polling && loaded ? 'contrast' : 'light'">
+    <ion-toolbar [color]="isOnline && polling && loaded ? null : 'light'">
         <p class="ion-text-center" *ngIf="!isOnline">
             {{ 'addon.mod_chat.mustbeonlinetosendmessages' | translate }}
         </p>

src/core/features/comments/pages/viewer/viewer.html

@@ -64,7 +64,7 @@
     </core-loading>
 </ion-content>
 <ion-footer class="footer-adjustable" *ngIf="commentsLoaded && canAddComments">
-    <ion-toolbar color="contrast">
+    <ion-toolbar>
         <core-send-message-form [sendDisabled]="sending" [message]="newComment" (onSubmit)="addComment($event)"
             [placeholder]="'core.comments.addcomment' | translate">
         </core-send-message-form>

src/theme/theme.base.scss

@@ -253,10 +253,6 @@ ion-tabs.hide-header ion-header {
     display: none;
 }
 
-ion-footer ion-toolbar.ion-color-contrast {
-    background-color: var(--contrast-background);
-}
-
 ion-footer {
     background-color: var(--contrast-background);
 }