Revert "fixup! stbt.press: Log keypress to debug log"

This reverts commit 328d3974123d44b8afb7b7bc927004526172c94e.

Instead I'll apply https://github.com/drothlis/stb-tester/pull/203
Revert "stbt.press: Log keypress to debug log"

This reverts commit 841be8960244c000be44d1659b2cae3b020b85f5.

Instead I'll apply https://github.com/drothlis/stb-tester/pull/203
stbt._X11Remote.press: Log keypress

Just like all the other remote-control implementations. This makes
debugging test failures much easier.

Arguably the logging should be done by `stbt.press`, but for example the
`_SamsungTCPRemote.press` implementation logs "Pressed" first and then
logs the reply; and `NullRemote.press` logs "Ignoring request to press".