fix: apply nav-indent left padding correctly

[Kneemund]

In the latest version of AdminLTE v4 (rc7), the nav-indent behaves unexpectedly. The SCSS selector .nav-indent & is compiled to .nav-indent .sidebar-menu .nav-treeview.

That means that you would have to apply nav-indent to a parent of the sidebar menu (e.g. the sidebar wrapper), which is very unintuitive compared to the other nav classes.

In compact mode, the selector for the equivalent rule is simply .nav-compact.nav-indent .nav-treeview, which means that .nav-indent works differently (and as expected) there.

This PR makes the problematic non-compact mode rule behave the same as the other nav-indent rules.

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[puikinsh]

Thanks @Kneemund! Great catch on the selector scoping — the .nav-indent & nesting was definitely unintuitive compared to how .nav-compact.nav-indent works. Appreciate you keeping things consistent. Merging this in. 👍