refactor(card): fix thumbnail position to match webC

Author: desig9stein

projects/igniteui-angular/src/lib/core/styles/components/card/_card-theme.scss

@@ -158,7 +158,7 @@
     %igx-card-header {
         display: flex;
         flex-flow: row wrap;
-        align-content: flex-start;
+        align-items: center;
         width: 100%;
         padding: $card-heading-padding;
         color: var-get($theme, 'header-text-color');
@@ -194,7 +194,6 @@
     }
 
     %igx-card-header-thumbnail {
-        align-self: flex-start;
         margin-inline-end: rem(16px);
 
         @if $variant == 'indigo' {