Fixed react-bootstrap tabs warnings

We can't use our own "id" values here, since react-bootstrap requires internal consistency
between tab containers and tab panes through its own auto-generated identifiers

admin/client/src/components/Tabs/TabItem.js

@@ -17,7 +17,6 @@ class TabItem extends SilverStripeComponent {
       onExiting,
       onExited,
       animation,
-      id,
       unmountOnExit,
       } = this.props;
 
@@ -33,9 +32,7 @@ class TabItem extends SilverStripeComponent {
       onExiting,
       onExited,
       animation,
-      id,
       unmountOnExit,
-      'aria-labelledby': this.props['aria-labelledby'],
     };
   }
 

admin/client/src/components/Tabs/Tabs.js

@@ -14,6 +14,7 @@ class Tabs extends SilverStripeComponent {
       onSelect,
       className,
       extraClass,
+      id,
       } = this.props;
     const combinedClassName = `${className} ${extraClass}`;
 
@@ -22,6 +23,7 @@ class Tabs extends SilverStripeComponent {
       className: combinedClassName,
       defaultActiveKey: this.getDefaultActiveKey(),
       onSelect,
+      id,
     };
   }