Removed pin setting functionality

- Simplifies security options: use multi user mode if you want to restrict access to the settings menu

src/app/settings/settings.component.html

@@ -186,10 +186,6 @@
                     <div class="col-12">
                         <mat-checkbox color="accent" [(ngModel)]="new_config['Extra']['allow_multi_download_mode']"><ng-container i18n="Allow multi-download mode setting">Allow multi-download mode</ng-container></mat-checkbox>
                     </div>
-                    <div class="col-12">
-                        <mat-checkbox [disabled]="new_config['Advanced']['multi_user_mode']" color="accent" [(ngModel)]="new_config['Extra']['settings_pin_required']"><ng-container i18n="Require pin for settings setting">Require pin for settings</ng-container></mat-checkbox>
-                        <button style="margin-left: 15px; margin-bottom: 10px;" mat-stroked-button (click)="setNewPin()" [disabled]="!new_config['Extra']['settings_pin_required']"><ng-container i18n="Set new pin button">Set New Pin</ng-container></button>
-                    </div>
                 </div>
             </div>
             <mat-divider></mat-divider>

src/app/settings/settings.component.ts

@@ -1,6 +1,5 @@
 import { Component, OnInit } from '@angular/core';
 import { PostsService } from 'app/posts.services';
-import { CheckOrSetPinDialogComponent } from 'app/dialogs/check-or-set-pin-dialog/check-or-set-pin-dialog.component';
 import { isoLangs } from './locales_list';
 import { MatSnackBar } from '@angular/material/snack-bar';
 import {DomSanitizer} from '@angular/platform-browser';
@@ -77,14 +76,6 @@ export class SettingsComponent implements OnInit {
     })
   }
 
-  setNewPin() {
-    const dialogRef = this.dialog.open(CheckOrSetPinDialogComponent, {
-      data: {
-        resetMode: true
-      }
-    });
-  }
-
   generateAPIKey() {
     this.postsService.generateNewAPIKey().subscribe(res => {
       if (res['new_api_key']) {