Generated wrong patterns in gitignore file

Generated unrecognizable prefix `./` in gitignore file when run `mxgit --install` at project's root directory.
```
#mxgit-marker-start
./.svn
./modeler-merge-marker
./.mendix-cache
./*.mpr.lock
./*.mpr.bak
./*.mpr.left*
./*.mpr.right*
./.settings
./deployment
./releases
proxies
*.launch
.classpath
.project
#mxgit-marker-end
```