Fix types for events

src/ol/control/MousePosition.js

@@ -148,7 +148,7 @@ class MousePosition extends Control {
   }
 
   /**
-   * @param {Event} event Browser event.
+   * @param {MouseEvent} event Browser event.
    * @protected
    */
   handleMouseMove(event) {

src/ol/control/OverviewMap.js

@@ -243,7 +243,7 @@ class OverviewMap extends Control {
     const move = function (event) {
       const position = /** @type {?} */ (computeDesiredMousePosition(event));
       const coordinates = ovmap.getEventCoordinateInternal(
-        /** @type {Event} */ (position)
+        /** @type {MouseEvent} */ (position)
       );
 
       overlay.setPosition(coordinates);