Don't crash when displaying the " key

When displaying any key selection that has a " key, AOSP 8.0.0_r4's
LatinIME crashes.

The problem is that XML escapes are handled too early:
latin:keySpec=""" becomes latin:keySpec=""" before it's fed to
an XML parser, causing a syntax error.

https://issuetracker.google.com/issues/65090157



Change-Id: I7b52fc62c874075d572a631c75e87caad1d365c0
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>