perf ui browser: Return the current color when setting a new one

Tools that want to change parts of the line to a different color and
then restore the previous one will use this, starting with the annotate
browser that will change the color of addresses if not on the current
entry, i.e. the selected one.

Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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