- replace unicode char with ascii space

• was causing compile error with clang on linux for me due to '\xC2', '\xA0' chars not being constexpr:
  • Dune::Logging::format_string<char, 'T', 'i', 'm', 'e', ' ', 'S', 't', 'e', 'p', ' ', '{', ':', '.', '2', 'e', '}', ' ', '+', ' ', '{', ':', '.', '2', 'e', '}', '\xC2', '\xA0', '-', '>', ' ', '{', ':', '.', '2', 'e', '}'>, 0>'

merged

mentioned in commit b665e220

assigned to @santiago.ospina

changed milestone to %ES1 - First integrated software release