fix wrong parameters for git step

[Ching Yi, Chan]

1. the build.groovy is using the old repo
2. branch not set into git step

[Ching Yi, Chan]

the original code is:

        git url: 'https://[e-mail]/qrtt1/jenkinskata.git'
            branch: 'master'

the sample code is a demo for "branch" parameter:

def call(m = [:]) {
    println m
}

call url: "url"
     branch: "branch"
println "another statement"

the output is:

$ groovy magic.groovy
[url:url]
another statement

the branch is not set, because we lose the "," for map syntax.
here is the patched code will show the correct output:

--- magic.groovy    2016-10-15 22:55:09.000000000 +0800
+++ correct.groovy  2016-10-15 23:06:54.000000000 +0800
@@ -3,6 +3,6 @@
     println m
 }

-call url: "url"
+call url: "url",
      branch: "branch"
 println "another statement"