fix running validate with -v

running ./.git/hooks/validate.sh -v gives me

Assertion failed: Precondition: hash -v must have length 64.
Backtrace:
  [1]: ./.git/hooks/timestamping : extract_token_from_commit line 200
  [2]: ./.git/hooks/validate.sh : validate_commit line 97
  [3]: ./.git/hooks/validate.sh : validate_commit_and_parents line 300
  [4]: ./.git/hooks/validate.sh : main line 329

this commit fixes the issue

hooks/validate.sh

@@ -43,7 +43,7 @@ if [[ ! -d "$DIR" ]]; then DIR="$PWD"; fi
 
 declare -i MINVERSION=$TIMESTAMPING_VERSION
 
-while [[ $# -gt 1 ]]; do
+while [[ $# -gt 0 ]]; do
   KEY="$1"
 
   case $KEY in
@@ -66,12 +66,12 @@ while [[ $# -gt 1 ]]; do
       shift # past argument
       ;;
     *) # unknown option
-      echo_error "Unknown argument: $KEY"
-      exit 1
+      OBJECT=$KEY
+      shift # past argument
       ;;
   esac
 done
-OBJECT="$1"
+
 if [ -z "$OBJECT" ]; then
   OBJECT="HEAD"
 fi
@@ -332,4 +332,4 @@ if validate_commit_and_parents "$COMMIT_HASH"; then
 else
   echo_error "Validation Failed: There are timestamped commits in the commit history of $COMMIT_HASH which do not contain any valid timestamps."
   exit 1
-fi
+fi