Remove the unnecessary project path check from build.gradle

https://github.com/apache/kafka/blob/trunk/build.gradle#L132
```
if (!project.path.startsWith(":connect") && !project.path.startsWith(":storage"))
options.compilerArgs << "-Xlint:-rawtypes"
```
in the block the project path is not initialized, so it is always empty.