Hide UpdateAvailableComponent in AppComponent (#355)

Fixes #350

electron/src/app/app.component.html

@@ -1,5 +1,4 @@
-<app-update-available
-    [showUpdateAvailable]="showUpdateAvailable$ | async"
+<app-update-available *ngIf="showUpdateAvailable$ | async"
     (updateApp)="updateApp()"
     (doNotUpdateApp)="doNotUpdateApp()">
 </app-update-available>

electron/src/components/update-available/update-available.component.html

@@ -1,4 +1,4 @@
-<div *ngIf="showUpdateAvailable">
+<div class="app-update-available-wrapper">
     New version available.
     <button type="button" (click)="updateApp.emit()" class="btn btn-primary">Update</button>
     <button type="button" (click)="doNotUpdateApp.emit()" class="btn btn-default">Close</button>

electron/src/components/update-available/update-available.component.scss

@@ -1,4 +1,4 @@
-:host {
+.app-update-available-wrapper {
     display: flex;
     justify-content: center;
     margin: 0.5rem;

electron/src/components/update-available/update-available.component.ts

@@ -1,4 +1,4 @@
-import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output } from '@angular/core';
+import { ChangeDetectionStrategy, Component, EventEmitter, Output } from '@angular/core';
 
 @Component({
     selector: 'app-update-available',
@@ -7,7 +7,6 @@ import { ChangeDetectionStrategy, Component, EventEmitter, Input, Output } from
     changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class UpdateAvailableComponent {
-    @Input() showUpdateAvailable: boolean = false;
     @Output() updateApp = new EventEmitter<null>();
     @Output() doNotUpdateApp = new EventEmitter<null>();
 }