clang-tidy: modernize-use-default-member-init: set UseAssignment.
clang-tidy: modernize-use-default-member-init: set UseAssignment.

OK, '{}' is ugly.

darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed