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Change-Id: I10cf9e2705c0d4aa3c9bc1a3293916a1f940e378
incallui: fix callbuttons xxhdpi images

Fix addParticipant and modifyCall images to properly fit in xxhdpi resolutions

Change-Id: I9f1ff0517a86a25660295f1302d0d20e2482fd12
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>