Revert "Stats: fix regex for jb-mr1 builds"

This reverts commit d26ac23c5a6a2c28660e670641b33f720e9526af.
Revert "Settings: adjust stats regexp to match new unofficial version"

This reverts commit ff6b477ea2ef54c77dfee99a5ad5eb83ae72e8cf.
Revert "Stats: report jb-nightly instead of reporting date"

This reverts commit 9dac39ebcbf94178d3be85766d2d39078ba2abcb.
Revert "Stats - amend regexp to match nightlies"

This reverts commit f443be5e45d551410152d9817881625c77d06403.