fix(history): fix edge cases, add comments

lib/history.zsh

@@ -1,5 +1,6 @@
 ## History wrapper
 function omz_history {
+  # parse arguments and remove from $@
   local clear list stamp
   zparseopts -E -D c=clear l=list f=stamp E=stamp i=stamp
 
@@ -9,14 +10,14 @@ function omz_history {
   elif [[ -n "$clear" ]]; then
     # if -c provided, clobber the history file
     echo -n >| "$HISTFILE"
-    fc $stamp -p "$HISTFILE"
+    fc -p "$HISTFILE"
     echo >&2 History file deleted.
   elif [[ -n "$list" ]]; then
     # if -l provided, run as if calling `fc' directly
-    builtin fc $stamp "$@"
+    builtin fc $stamp -l "$@"
   else
     # otherwise, run `fc -l` with a custom format
-    builtin fc -l "$@"
+    builtin fc $stamp -l "$@"
   fi
 }