Getting this context for switch hotbar methods

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

src/common/hotbar-store.ts

@@ -285,7 +285,7 @@ export class HotbarStore extends BaseStore<HotbarStoreModel> {
     }
   }
 
-  switchToPrevious() {
+  switchToPrevious = () => {
     let index = this.activeHotbarIndex - 1;
 
     if (index < 0) {
@@ -293,9 +293,9 @@ export class HotbarStore extends BaseStore<HotbarStoreModel> {
     }
 
     this.setActiveHotbar(index);
-  }
+  };
 
-  switchToNext() {
+  switchToNext = () => {
     let index = this.activeHotbarIndex + 1;
 
     if (index >= this.hotbars.length) {
@@ -303,7 +303,7 @@ export class HotbarStore extends BaseStore<HotbarStoreModel> {
     }
 
     this.setActiveHotbar(index);
-  }
+  };
 
   /**
    * Checks if entity already pinned to the active hotbar