Widget bugs fixed 🐛

[Freymaurer]

Fixes 3 bugs with widgets:

• Bug 1: Widgets jump to 0 on x-axis as soon as the right screen window border touches them, like scared little kitties 🐈
• Bug 2: overflow for term search was set to scrollable
• Bug 3: Opening all widgets with the same params (Building Block, FilePicker, DataAnnotator), then clicking on them to get them in front made react not understand that they switched and reused their states (typical missing key issue). So i added a key to base widget and now they stay where they are supposed to stay.

[Freymaurer]

This should also fix some of the issues in #634 and #629