Update codestyle

[StefMa]

Fixes #20

I've done following:

• Installed the current (master branch) codestyle
• Closed AS
• Opened AS
• Selected the grandcentrix codestyle
• Click copy to project
• Click apply -> done
• Open settings again and click export
• Replaced the styles/grandcentrix.xml with the exported XML file

[passsy]

• I then installed the codestyle from this PR
• Restarted AS
• Selected the grandcentrix codestyle
• Click copy to project
• Click apply -> done

The result is no diff of the .idea/codeStyles/Project.xml 🎉

[rehlma]

Works perfectly for me as well 🎉