Indent tab stops that start from the first line of snippet properly

[Ingramz]

Description of the Change

This fixes a simple case of tab stop indentation not applying properly if following conditions are met:

1. The snippet's tab stop starts from the initial line of the snippet and ends on another line
2. The snippet expanded on an indented position on the document.

Alternate Designs

None considered.

Benefits

Bugfix.

Possible Drawbacks

Anticipating none.

Applicable Issues

https://github.com/jawee/language-blade/pull/92#issuecomment-617343497