zprofile: Fix non-export of FZF_DEFAULT_NO_RG

I never really noticed but `$FZF_ALT_C_COMMAND` was never set as
`$fzf_default_no_rg` would be empty. Because the variable was not
exported, the X session would not have it in it's environment.

.config/zsh/zshrc.d/60-keys.zsh

@@ -232,5 +232,5 @@ bindkey -M vicmd '^K' fzf-history-widget
 FZF_CTRL_T_COMMAND="${FZF_DEFAULT_COMMAND} 2>/dev/null"
 # Use the fallback default command when ripgrep is not installed but with
 # directories instead of files.
-FZF_ALT_C_COMMAND="${fzf_default_no_rg/-type f/-type d}"
+FZF_ALT_C_COMMAND="${FZF_DEFAULT_COMMAND_NO_RG/-type f/-type d}"
 comp-source "$ZDOTDIR/plugins/fzf/shell/key-bindings.zsh"