`FIX`: `label` inside code block breaks `return` indentation

[kyklish]

Closes #432.

Changes proposed in this pull request:

• make indent inside label only in top level code. No indent inside nested code blocks.
• change ahk++.formatter.indentCodeAfterLabel description in settings.

Indented code after Hotkey and Label needed only in top level hierarchy. Inside nested code blocks indent not needed. Optional behavior may be like in Switch-Case construction, where Case CaseValue: label has lower indent then code.

Switch [SwitchValue]
{
Case CaseValue1: ; <-- lower indent
    Statements1
Case CaseValue2a, CaseValue2b:
    Statements2
Default:
    Statements3
}

Notifying @mark-wiemer