Improve placement of Change-Id line

...so that it is not added to a block of lines from the original commit message
that happen to start with letters followed by a colon but then not followed by a
space, as happened for 9e73f972b0.

Change-Id: I388c194645a1577e5446891f508b31f761d1bbbf

git-hooks/commit-msg

@@ -125,7 +125,7 @@ add_ChangeId() {
                 for($line = @message - 1; $line >= 0; $line--) {
                         $_ = $message[$line];
 
-                        if (/^[a-zA-Z0-9-]+:/ && !m,^[a-z0-9-]+://,) {
+                        if (/^[a-zA-Z0-9-]+: /) {
                                 $haveFooter++;
                                 next;
                         }