Some changes in project config file to prevent "no repository found" errors on installation

[mmueller013]

I commented out the following lines to prevent "no repository found" errors during installation with eclipse 2020-03:

line 146-147

      <!--repository
          url="https://download.eclipse.org/egit/updates"/-->

line 204- 205

      <!--repository
          url="http://download.eclipse.org/egit/github/updates"/-->

[LorenzoBettini]

This one https://download.eclipse.org/egit/updates works for me, but probably it's not needed anymore since its plugins are taken from the main Eclipse update site.
@mmueller013 would you mind providing a PR? Better to remove them, than to comment them.
Thanks in advance

[mmueller013]

Hi Lorenzo,
I cloned your Repository, and tried to reproduce the errors, to provide detailed information to the commit. Unfortunately, I cannot reproduce any "no repository found" errors today. I removed eclipse and the eclipse installer completely from my computer, and deleted any eclipse related directories from %TEMP% and %USER%. But no errors today ...
I have absolutely no explanation for that. I'm sorry for that.
Best regards Matthias