SSR error, add isBrowser check for share buttons

[maxsv0]

Error in ngx-sharebuttons usage.

->share.component.ts
import {Component, Inject, OnInit, PLATFORM_ID} from '@angular/core';
import { isPlatformBrowser } from '@angular/common';
....
export class ShareComponent implements OnInit{
isBrowser;
....
constructor(@Inject(PLATFORM_ID) private platformId: Object) { }

ngOnInit() {
    this.isBrowser = isPlatformBrowser(this.platformId);
    .....
 
  }
 ....
}
->share.component.html
<div class="..." *ngIf="isBrowser">
        <share-buttons show="5"></share-buttons>
 </div>