Scroll to top on changing page.

[ADRE9]

Issue Number fixes #137

Describe the changes you've made On swiping to the next the page will open from the top as scroll to top will be implemented for every Bottom Tab.

Additional context https://user-images.githubusercontent.com/49809895/112495154-a3add500-8da9-11eb-9145-d981a56d1d91.mp4

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] All new and existing tests passed.
• [x] The title of my pull request is a short description of the requested changes.

[ADRE9]

I'll check it tomorrow and make another PR.

[Abhishek-kumar09]

its good now i think, just add a linebreak at the end and two files will become identical

[ADRE9]

I'll re do it after my exams tomorrow.😕