MOBILE-3320 core: Fix inline on empty box component

src/addons/block/myoverview/components/myoverview/addon-block-myoverview.html

@@ -74,7 +74,7 @@
     </ion-searchbar>
 
     <core-empty-box *ngIf="filteredCourses.length == 0" image="assets/img/icons/courses.svg"
-        [message]="'addon.block_myoverview.nocourses' | translate" class="core-empty-inline">
+        [message]="'addon.block_myoverview.nocourses' | translate" inline="true">
     </core-empty-box>
 
     <!-- List of courses. -->

src/addons/block/timeline/components/events/addon-block-timeline-events.html

@@ -54,4 +54,5 @@
 </div>
 
 <core-empty-box *ngIf="empty" image="assets/img/icons/activities.svg" [message]="'addon.block_timeline.noevents' | translate"
-[inline]="!showCourse"></core-empty-box>
+    inline="true">
+</core-empty-box>

src/addons/mod/wiki/components/index/addon-mod-wiki-index.html

@@ -83,7 +83,7 @@
                 contextLevel="module" [contextInstanceId]="module.id" [courseId]="courseId">
             </core-format-text>
             <core-empty-box *ngIf="!pageContent" icon="fas-file-alt" [message]="'addon.mod_wiki.nocontent' | translate"
-                [inline]="true">
+                inline="true">
             </core-empty-box>
         </article>
 

src/core/components/empty-box/empty-box.ts

@@ -37,7 +37,7 @@ export class CoreEmptyBoxComponent {
      * If this has to be shown inline instead of occupying whole page.
      * If image or icon is not supplied, it's true by default.
      */
-    @Input() inline?: boolean;
-    @Input() flipIconRtl?: boolean; // Whether to flip the icon in RTL. Defaults to false.
+    @Input() inline = false;
+    @Input() flipIconRtl = false; // Whether to flip the icon in RTL. Defaults to false.
 
 }