Scrolling to selection when selecting path to the receiver class in the meta browser (Fix for the meta browser in the inspector)

[adri09070]

Fixes pharo-project/pharo#14863

In StMetaBrowser, at the initialization, it selects the path to the class of the selected object

StMetaBrowserPresenter>>#initializePresenters
  ...
  classes selectPath: (Array new: classHierarchy size withAll: 1)

However, if the meta browser is too small, it would result in not showing the receiver class (and not even showing a scrollbar to get to it). This is the case in the debugger inspector which is smaller than the normal inspector (but I guess it would appear in the normal inspector if you have class hierearchy with big depths):

I fixed it so that it automatically scrolls to the receiver class because it is (generally) the class of interest:

StMetaBrowserPresenter>>#initializePresenters
  	classes
		selectPath: (Array new: classHierarchy size withAll: 1)
		scrollToSelection: true

And now the scrollbar appears correctly and everything is fine: even in the debugger inspector