fix for controls that hide if keyboard scrubbing

In version 2.9, I reported issue #548, that controls hide when using
keyboard to scrub even if the alwaysShowControls option is set to
"true." Pull request #569 merged this fix, but did so in the /build
directory. It appears that fix did not move forward with versions and
the issue is occurring in the latest version. Adding fix in the /src
directory so that future builds get the fix.