clonebundle: move the manifest filename to a constant
I am about to add more reference to it, so I would rather have it an explicit
constant. This allow to unify various call too.
Differential Revision: https://phab.mercurial-scm.org/D9209
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
end_of_line = lf
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
end_of_line = lf
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false
end_of_line = lf