Fixes two issues:
1. Evil users would be left in visual mode after expanding a snippet on
a region, making it awkward to insert text. It now switches to insert
state.
2. While yasnippet reindent the snippet's contents post-expansion, org's
mode-specific indentation (see `org-src-tab-acts-natively`) can throw
errors for arbitrary reasons. We don't need smart indentation when
expanding snippets, so we turn it off only in this case.
518e53deab