[MAINTAIN-200] remove buttons margin for non IOS devices.

[manachynskyi]

Issue This PR should improve indents between buttons and the bottom of the screen on iOs/Android devices.

This PR should be compared on mobile iOS and Android (mobile resolution of desktop browser)
Steps for review (on mobile):

• Visit activity finder 4 page
• Start from Ages step https://i.imgur.com/1xQnb5E.png and go through all steps
• make sure on iOS we have an indent under the button (skip/next)
• make sure on android/web indent missed and button stuck to the bottom of the screen https://i.imgur.com/0TLGSP8.png
• on the result page
• Click on the session details
• add an item to the bookmark items https://i.imgur.com/dDX9BvZ.png
• open bookmarked items https://i.imgur.com/LmulRDz.png
• make sure the bottom region is stuck to the bottom of the screen on Android and a small indent added on iOS https://i.imgur.com/QnzIpu0.png
• open filters https://i.imgur.com/Z9xkP1e.png
• make sure buttons have same behavior as in previous cases https://i.imgur.com/t7Z0MGR.png

[podarok]

Your thoughts?

[podarok]

Are we sure we want to have this library https://github.com/duskload/mobile-device-detect/pulls
A lot of opened security issues @hamrant

[podarok]

I'd rather fork it or get maintainer access and fix those security issues

[hamrant]

@podarok nice catch!

Ok, we can try a solution without an additional library with data from Window.navigator - https://developer.mozilla.org/en-US/docs/Web/API/Window/navigator (For now it has good browser compatibility).

How to detect iOs device - https://racase.com.np/javascript-how-to-detect-if-device-is-ios/
How to detect mobile device - https://stackoverflow.com/questions/11381673/detecting-a-mobile-browser

const isMobile = navigator.userAgentData.mobile; //resolves true/false

cc @manachynskyi

[podarok]

Great, let's use it instead of insecure dependency
Thank you @hamrant

[manachynskyi]

I used only checking by userAgent, because userAgentData is experimental and not supported by all browsers. I tested on different iphones and ipads (on emulator) it seems that all works fine.