Fix typo in HISTCONTROLL assignment

dotfiles/bash/main.bashrc

@@ -25,7 +25,7 @@ clear_to_bottom() {
 ### BASH ###
 ### '''' ###
 
-export HISTCONTROL=$HISTCONTROL${HISTCONTROL+:}ignoredups
+export HISTCONTROL=$HISTCONTROL${HISTCONTROL:+:}ignoredups
 export HISTIGNORE=$HISTIGNORE:ls:ll:la:cd
 export HISTIGNORE="$HISTIGNORE:git ap:git cm:git cma:git dc:git st"
 export HISTIGNORE="$HISTIGNORE:se"