[mining] use .slug to load pool logo

frontend/src/app/components/pool/pool-preview.component.ts

@@ -89,7 +89,7 @@ export class PoolPreviewComponent implements OnInit {
 
           this.openGraphService.waitOver('pool-stats-' + this.slug);
 
-          const logoSrc = `/resources/mining-pools/` + poolStats.pool.name.toLowerCase().replace(' ', '').replace('.', '') + '.svg';
+          const logoSrc = `/resources/mining-pools/` + poolStats.pool.slug + '.svg';
           if (logoSrc === this.lastImgSrc) {
             this.openGraphService.waitOver('pool-img-' + this.slug);
           }

frontend/src/app/components/pool/pool.component.ts

@@ -79,7 +79,7 @@ export class PoolComponent implements OnInit {
           poolStats.pool.regexes = regexes.slice(0, -3);
 
           return Object.assign({
-            logo: `/resources/mining-pools/` + poolStats.pool.name.toLowerCase().replace(' ', '').replace('.', '') + '.svg'
+            logo: `/resources/mining-pools/` + poolStats.pool.slug + '.svg'
           }, poolStats);
         })
       );