itstool: add missing COPYING.GPL3

to LIC_FILES_CHKSUM.
Format the list for better readability.
Remove useless line continuation from SRC_URI

(From OE-Core rev: ab25d08e16590c0b1e57a165b8a6db8dc263be7e)

Signed-off-by: Konrad Weihmann <kweihmann@outlook.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/itstool/itstool_2.0.7.bb

@@ -5,7 +5,10 @@ XML files. It determines what to translate and how to chunk it into \
 messages using the W3C Internationalization Tag Set (ITS). "
 HOMEPAGE = "http://itstool.org/"
 LICENSE = "GPL-3.0-only"
-LIC_FILES_CHKSUM = "file://COPYING;md5=59c57b95fd7d0e9e238ebbc7ad47c5a5"
+LIC_FILES_CHKSUM = "\
+    file://COPYING;md5=59c57b95fd7d0e9e238ebbc7ad47c5a5 \
+    file://COPYING.GPL3;md5=d32239bcb673463ab874e80d47fae504 \
+"
 
 inherit autotools python3native