When the configured name is Time and the frame has a field named time
(or the other way round), the fallback still matched every time field.
Now it only matches the field with the other spelling, and keeps
matching any time field when no field goes by either name.
The byName and byNames matchers fall back to matching any time field when
the configured name is Time or time, so configs keep working after the
dataplane rename. The fallback also kicked in when the frame already had a
field with that name, so hiding `time` in Organize fields hid every time
field and Filter by name could not drop the other ones.
The fallback now only applies when no field in the frame has that name or
display name.
dualfroz