Fix usable dimensions of the XP-PEN Artist 22R and 24 Pro

I didn't realize at the time that properties are supposed to be
the usable area, *not* the physical dimensions of the device.
Because #864 is not here yet, I rounded up for these.

Author: redstrate

data/xp-pen-artist-22r-pro.tablet

@@ -9,8 +9,8 @@ Name=XP-Pen Artist 22R Pro
 ModelName=
 DeviceMatch=usb|28bd|091b
 PairedIDs=
-Width=22
-Height=13
+Width=19
+Height=11
 IntegratedIn=Display
 Layout=xp-pen-artist22r-pro.svg
 Styli=@generic-no-eraser;

data/xp-pen-artist-24-pro.tablet

@@ -9,8 +9,8 @@ Name=XP-Pen Artist 24 Pro
 ModelName=
 DeviceMatch=usb|28bd|092d
 PairedIDs=
-Width=24
-Height=15
+Width=21
+Height=12
 IntegratedIn=Display
 Layout=xp-pen-artist24-pro.svg
 Styli=@generic-no-eraser;