zsh:keys: Remove fzf-hist functionality

Go back to a simpler approach, that the `fzf-history-widget` is only
called on <C-Up> and ^K in normal mode and <Up> & <Down> scroll through
the history normally.

The reason behind this change is that there were still some edge cases
in which the widget was wrongfully called when normal scrolling was
intended.
This change also makes it now possible that I can use commands in the
'surrounding' of a past command by first navigating to it with the
fzf-widget and then just using <Up> & <Down>.

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

@@ -116,47 +116,16 @@ function cmd-on-enter {
 		CMD_ON_ENTER=ls
 	fi
 	zle accept-line
-
-	# See fzf-hist below
-	FZF_HIST_WENT_UP=
 }
 zle -N cmd-on-enter
 bindkey "^M" cmd-on-enter
 ZSH_AUTOSUGGEST_CLEAR_WIDGETS+=(cmd-on-enter)
 
-# "Scroll" through history if buffer was empty but use it as query for fzf over
-# command line history if not (similar to substring-search but with fzf)
-function fzf-hist-up {
-	if [[ -z "$BUFFER" || "$FZF_HIST_WENT_UP" -eq 1 ]]; then
-		zle up-line-or-history
-		FZF_HIST_WENT_UP=1
-	else
-		# Will take BUFFER as query
-		fzf-history-widget
-	fi
-}
-function fzf-hist-down {
-	zle down-line-or-history
-	[[ -n "$BUFFER" ]] || FZF_HIST_WENT_UP=
-}
-zle -N fzf-hist-up
-zle -N fzf-hist-down
-
 ## History
-# Up
-bindkey '^[[A' fzf-hist-up
-bindkey "$terminfo[kcuu1]" fzf-hist-up
 # Ctrl-Up
 bindkey '^[[1;5A' fzf-history-widget
-# Down
-bindkey '^[[B' fzf-hist-down
-bindkey "$terminfo[kcud1]" fzf-hist-down
-# Ctrl-K
-bindkey '^K' fzf-hist-up
 # Ctrl-K in normal mode
 bindkey -M vicmd '^K' fzf-history-widget
-# Ctrl-J
-bindkey '^J' fzf-hist-down
 
 # Fuzzy finder bindings:
 # ^T fzf-file-widget