data: confirm the Huion RTP-700

See linuxwacom#784 (comment)

data/huion-rtp-700.tablet

@@ -1,18 +1,32 @@
-# This tablet description file has been generated using an automated tool:
-# https://github.com/JoseExposito/uclogic-libwacom-tablet-descriptions
-# If you own this tablet, please improve it.
+# Huion
+# RTP-700
 #
-# sysinfo missing - if you own this device please provide it. See this link
-# for details: https://github.com/linuxwacom/libwacom/wiki/Adding-a-new-device
-
+# sysinfo.XzvBqrnM2S.tar.gz
+# https://github.com/linuxwacom/wacom-hid-descriptors/issues/420
+#
+# Button Map:
+# (A=1, B=2, C=3, ...)
+#
+#    +----------------------------------+
+#    |                                  |
+#  A |                                  |
+#  B |                                  |
+#  C |                                  |
+#    |                                  |
+#    |                                  |
+#    |                                  |
+#  D |                                  |
+#  E |                                  |
+#  F |                                  |
+#    |                                  |
+#    +----------------------------------+
 [Device]
 Name=Huion RTP-700
 ModelName=RTP-700
 Class=Bamboo
-# Product ID is unknown, please fix
-DeviceMatch=usb|256c|006e||HUION_T19k;usb|256c|006d||HUION_T19k;usb|256c|006f||HUION_T19k;usb|256c|0064||HUION_T19k;
-Width=9  # autogenerated value, please fix
-Height=6  # autogenerated value, please fix
+DeviceMatch=usb|256c|0064||HUION_T19k
+Width=11
+Height=7
 Layout=huion-rtp-700.svg
 Styli=@generic-no-eraser;
 IntegratedIn=