Don't indent end-of-file marker

[palfrey]

Currently, the add-bind-mount code adds something like

    cat > "$unit_path" << UNIT
    [Unit]
    Description=Bind mount $1 over $2
    DefaultDependencies=no
    Conflicts=umount.target
    Before=local-fs.target umount.target

    [Mount]
    What=$1
    Where=$2
    Type=none
    Options=bind

    [Install]
    WantedBy=local-fs.target
    UNIT

    systemctl daemon-reload

with UNIT indented, which gets you errors like

Configuring templatectl.
//opt/lib/opkg/info/templatectl.postinst: line 998: warning: here-document at line 21 delimited by end-of-file (wanted `UNIT')
//opt/lib/opkg/info/templatectl.postinst: line 999: syntax error: unexpected end of file

This PR unindents that.

[Eeems]

Instead of adjusting this line to no longer match the formatting of the rest of the file, It would be better to call inspect.cleandoc() in add_method().

[palfrey]

Instead of adjusting this line to no longer match the formatting of the rest of the file, It would be better to call inspect.cleandoc() in add_method().

Hadn't seen that method before actually! Tested it locally, seems to resolve the problem.