fix: android blur method (#447)

Co-authored-by: Santiago Lopez Bayo <santiago.bayo@bitmex.com>

Author: slopez93

android/src/main/java/com/reactnativecommunity/picker/ReactPicker.java

@@ -206,6 +206,12 @@ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     }
   }
 
+  public void clearFocus() {
+    super.setFocusableInTouchMode(true);
+    super.setFocusable(true);
+    super.onDetachedFromWindow();
+  }
+
   public void setOnSelectListener(@Nullable OnSelectListener onSelectListener) {
     mOnSelectListener = onSelectListener;
   }