message: Improve github PR template
diff: <!-- You have to tick all the boxes -->
  - [x] I have read the [CONTRIBUTING](https://github.com/swaponline/swap.react/wiki/CONTRIBUTING) guide
  -- [x] branch rebased on `master`
  -- [x] styleguide check `npm run validate`
  -- [x] good naming
  -- [x] keep simple
  -- [x] video or screenshot attached
  -- [x] testing instruction attached
  +- [x] Styleguide check `npm run validate`
  +- [x] Good naming
  +- [x] Keep simple
  +- [x] I checked desktop/mobile version
  +- [x] I checked bright/dark mode
  +- [x] I checked en/ru version
  +- [x] Affects money; I checked the functionality once again
  +- [x] Video or screenshot attached
  +- [x] Testing instruction attached
  - [x] I checked the PR once again
  ### Description
  -<!-- Include issue number and motivation for these code changes -->
  +<!-- Include issue number (#1234) or motivation for these code changes -->
  ### Video or screenshot
  