chore: Use screenshot name as-is

[tianfeng92]

Use screenshot name as-is. https://app.saucelabs.com/tests/1be160feb1724b5495275fe24365b573

[mhan83]

In the linked job, the screenshots are all the same https://assets.saucelabs.com/jobs/1be160feb1724b5495275fe24365b573/test-finished-1.png

[tianfeng92]

In the linked job, the screenshots are all the same https://assets.saucelabs.com/jobs/1be160feb1724b5495275fe24365b573/test-finished-1.png

Yep. Because the screenshot folder structure is like

__assets__/demo-todo-app-Editing-should-save-edits-on-blur-webkit
__assets__/demo-todo-app-Editing-should-save-edits-on-blur-webkit/test-finished-1.png
__assets__/demo-todo-app-Routing-should-allow-me-to-display-all-items-chromium
__assets__/demo-todo-app-Routing-should-allow-me-to-display-all-items-chromium/test-finished-1.png

We're handling those assets flattened. So only test-finished-1.png got uploaded and overwritten. This issue is existing for all frameworks and it'd better to keep the consistency here until platform has the ability to handle nested assets structure. So I reverted the filename composition here and use it as is.