Fix clone-sample-repos
Script clone-sample-repos is aimed to clone the sample repos in the SDK, however, it does not properly point the branch that should be used as it does not take into account the distribution id.
Fix the issue by properly point to the branch name.
Also drop the helloworld-webapp since it is no longer supported.
Signed-off-by: Walter Lozano walter.lozano@collabora.com