Tig writes to `~/.tig_history` by default

Tig writes to ~/.tig_history on a clean install:

• No configuration file
• No TIG_ environment variables.
• No XDG_ environment variables.

According to the manual:

$XDG_DATA_HOME/tig/history. If $XDG_DATA_HOME is empty or undefined, store history to ~/.local/share/tig/history if the directory ~/.local/share/tig/ exists, and fall back to ~/.tig_history if it does not exist.

For proper XDG compliance, Tig should not require the directory ~/.local/share/tig/ to be created, it should write to ~/.local/share/tig/history by default.