qutebrowser: fix/change hotkeys
qutebrowser: fix/change hotkeys

- Remove J, gt bindings
- Remove hacky "xxxx" style bindings (some of these are default bindings
  which require the use of <unbound> to unbind)

Note: the

    set-cmd-text -s :buffer
        gt

binding was set automatically by qutebrowser.

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg