Now passing layoutParams even when we already have dialog (#249)

- Fixes: https://github.com/beefe/react-native-picker/issues/248

android/src/main/java/com/beefe/picker/PickerViewModule.java

@@ -346,6 +346,9 @@ public class PickerViewModule extends ReactContextBaseJavaModule implements Life
             int height = barViewHeight + pickerViewHeight;
             if (dialog == null) {
                 dialog = new Dialog(activity, R.style.Dialog_Full_Screen);
+            } else {
+                dialog.dismiss();
+            }
             dialog.setContentView(view);
             WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
             Window window = dialog.getWindow();
@@ -363,10 +366,6 @@ public class PickerViewModule extends ReactContextBaseJavaModule implements Life
                 layoutParams.gravity = Gravity.BOTTOM;
                 window.setAttributes(layoutParams);
             }
-            } else {
-                dialog.dismiss();
-                dialog.setContentView(view);
-            }
         }
     }