fix(google-maps): Fix clickable input for MapMarker (#17396)

Fix default behavior of the clickable input for the MapMarker component.
Clickable should be true by default to match the Google Maps JavaScript
API, but currently is false by default.

Author: mbehrlich

src/google-maps/map-marker/map-marker.ts

@@ -360,32 +360,32 @@ export class MapMarker implements OnInit, OnDestroy {
 
   private _watchForTitleChanges() {
     this._title.pipe(takeUntil(this._destroy)).subscribe(title => {
-      if (this._marker) {
-        this._marker.setTitle(title !== undefined ? title : null);
+      if (this._marker && title !== undefined) {
+        this._marker.setTitle(title);
       }
     });
   }
 
   private _watchForPositionChanges() {
     this._position.pipe(takeUntil(this._destroy)).subscribe(position => {
-      if (this._marker) {
-        this._marker.setPosition(position || null);
+      if (this._marker && position) {
+        this._marker.setPosition(position);
       }
     });
   }
 
   private _watchForLabelChanges() {
     this._label.pipe(takeUntil(this._destroy)).subscribe(label => {
-      if (this._marker) {
-        this._marker.setLabel(label !== undefined ? label : null);
+      if (this._marker && label !== undefined) {
+        this._marker.setLabel(label);
       }
     });
   }
 
   private _watchForClickableChanges() {
     this._clickable.pipe(takeUntil(this._destroy)).subscribe(clickable => {
-      if (this._marker) {
-        this._marker.setClickable(!!clickable);
+      if (this._marker && clickable !== undefined) {
+        this._marker.setClickable(clickable);
       }
     });
   }