sway(env),zsh: make the $kee var $HOST-dependent

* have a fallback in ZSH in case it's not run with sway (in which case
  it could be empty)

.config/sway/env

@@ -4,7 +4,7 @@ CLUTTER_BACKEND=wayland
 
 EDITOR='vim'
 TERM='xterm-256color'
-kee="surtur"
+kee="$HOST"
 DOTNET_CLI_TELEMETRY_OPTOUT=1 # why do I always have to take care of this myself...
 
 ANDROID_SDK_ROOT="$HOME/utils/Android/Sdk"

.zshrc

@@ -162,7 +162,7 @@
  export QT_IM_MODULE=ibus
  export XMODIFIERS=@im=ibus
 # export ARCHFLAGS="-arch x86_64"
- export kee="surtur"
+ export kee=${kee:-$(hostnamectl --static)}
  SSH_KEY_PATH="$HOME/.ssh/$kee"
 
  eval $(TERM=xterm-kitty dircolors)