fix(_comp_delimited): work around bash-4.2 quoting

Author: akinomyoga

bash_completion

@@ -895,7 +895,10 @@ _comp_delimited()
         _comp_compgen COMPREPLY "$@" -- "${cur##*"$delimiter"}"
     fi
 
-    ((${#COMPREPLY[@]})) && COMPREPLY=("${COMPREPLY[@]/#/"$prefix"}")
+    local i
+    for i in "${!COMPREPLY[@]}"; do
+        COMPREPLY[i]="$prefix${COMPREPLY[i]}"
+    done
 
     [[ $delimiter != : ]] || __ltrim_colon_completions "$cur"
 }