simplify ${#@} to $#

In bash both are identical, in POSIX sh however ${#@} yields the string
length of $@. So after

	set 3 4 5

$@ expands to 5 in (e.g.) dash.

Author: ukleinek

bin/sys

@@ -5,7 +5,7 @@ function startsWithDash {
     test "${1:0:1}" = "-"
 }
 function paramsAreEmpty {
-    test ${#@} -eq 0
+    test $# -eq 0
 }
 
 function printHelp {