tests/test-revlog-raw.py.out

ui: add explicit path to write prompt text bypassing buffers

The prompt= flag was added at e35d7f131483, when colorui had its own write()
function. Since we've merged colorui to ui, we can simply call the unbuffered
write() function.

local test passed
addgroupcopy test passed
clone test passed
lowlevelcopy test passed