line <n> lines should be indented one level more

[mark-wiemer]

Describe the bug

In the demo for v1, when formatted, the lines between (LTrim and ) are indented to the same level:

str_multiline := "
(LTrim
line 1
line 2
line 3
)"

To Reproduce

Steps to reproduce the behavior:

1. Go to demos/demo_for_ahk_v1.ahk
2. Format the file
3. See error around line 15

Expected behavior

When formatted, the lines between (LTrim and ) should be indented further, like so:

str_multiline := "
(LTrim
    line 1
    line 2
    line 3
)"