style: center logo on theme selector

src/app/components/presentationals/theme-selector/theme-selector.presentational.html

@@ -8,7 +8,7 @@
     <mat-option *ngFor="let theme of listThemes"
                 [value]="theme"
     ><img class="option-theme-img"
-          style="max-height: 30px; max-width: 30px; padding-top: 16px;"
+          style="max-height: 30px; max-width: 30px; padding-top: 18px; padding-left: 24px;"
           [matTooltip]="stringUtil.convertToPascalCase(theme)"
           [matTooltipPosition]="'after'"
           [src]="getPathToImage(theme)"></mat-option>