No need to define project more than once.

This was breaking the build.

```
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR]   The project org.jenkins-ci.plugins:google-login:1.0-SNAPSHOT (/Users/kgarland/Downloads/google-login/pom.xml) has 1 error
[ERROR]     Malformed POM /Users/kgarland/Downloads/google-login/pom.xml: Unrecognised tag: 'project' (position: START_TAG seen ...</url>\n  </scm>\n\n  <project>... @19:12)  @ /Users/kgarland/Downloads/google-login/pom.xml, line 19, column 12 -> [Help 2]
[ERROR]
```