bitbake: data_smart: Fix unneeded variable manipulation

bitbake: data_smart: Fix unneeded variable manipulation

If was pointed out that if we have:

XXX = " A"
XXX_remove_inactive-override = "YY"

then XXX can become "A" and the leading space can be removed. This is because
the remove override code changes the variable value even when there is no
removals active. In the process it dirties the cache.

We don't really need to do this so tweak the code accordingly.

(Bitbake rev: 2bc4d35fb32defc59cd6ed1fc87e35924c201a5c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>