fix: Cannot specify trigger prop in controlled mode

In the popover, when using isOpen, it enters controlled mode. In
controlled mode, the trigger property is not allowed.

Added check to trigger property to only specify when isOpen is undefined

Author: Gido Manders

src/core/Popover/Popover.tsx

@@ -113,7 +113,13 @@ export function Popover({
       interactive={true}
       zIndex={1049} // One level below bootstrap's modal
       maxWidth={maxWidth}
-      trigger={openOnClick ? 'click' : 'mouseenter focus'}
+      trigger={
+        isOpen !== undefined
+          ? undefined
+          : openOnClick
+            ? 'click'
+            : 'mouseenter focus'
+      }
     >
       <Tag
         className={className}