[#300] feat: keep socket open on closed button

[chedieck]

Related to #300

Description

Changes the logic in order to make the onSuccess function still fire for a closed PayButton, as long as it has been opened once since page load.

Test plan

Make sure not only #300 is working well, but also sideshift altpayments & Widgets, since the changes also affect them.

[lissavxo]

I tested these cases ->

1. Button any amount
   trigger success when opened [yes]
   trigger success when closed [no]
2. Button with amount set
   trigger success when opened [yes]
   trigger success when closed [no]
3. Widget any amount
   trigger success [yes]
4. Widget with amount set
   trigger success [yes]

I also noticed altpayment is not working properly It freezes on loading step

[lissavxo]

It is not working properly, I was able to trigger the payment success behavior once but the other times I tried I can only hear the sound the dialog doesn't open

[Klakurka]

We need to make a decision around how to handle the user clicking multiple buttons on the page before paying.

If I open one button dialog, close it, then open a 2nd different one and pay to that, the first one will open up on top of my active button dialog.

One option is to only ever keep the last connection open. If somebody opens a new dialog, kill the old one.

Another option is to continue having it work as-is but if I pay to button #2, don't trigger #1 to open in my face.

Either option is good with me.

[Klakurka]

Conflicts.