Remove chart groups and shortcuts from tab buttons

These are features introduced in a recent update, but they made the chart tabs so wide that if you have several charts open in a single chart view (on my screen size it is 5+), you have to scroll left and right to see the other tabs.

In partcular:
- Chart groups (the different coloured letters) - I don't find this useful
- Timeframe shortcut on the tab button - unnecessary as the timeframe shortcut is just as easily accessible
- Detach chart - same as above; not necessary to have this on the tab button as you can very easily do this from the top right corner on the chart itself