[gdb/testsuite] Fix license text in gdb.reverse/map-to-same-line.{c,exp}

I noticed in gdb.reverse/map-to-same-line.{c,exp} that the license urls are
using some kind of indirection via urldefense.proofpoint.com.

Fix this by removing this indirection.

Tested on x86_64-linux.

PR testsuite/31358
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31358

gdb/testsuite/gdb.reverse/map-to-same-line.c

@@ -11,7 +11,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.gnu.org_licenses_&d=DwIDAg&c=jf_iaSHvJObTbx-siA1ZOg&r=RFEmMkZAk--_wFGN5tkM_A&m=hvslrRyYSFfiB2uOFjd7I62ZBKNJkGFWTdsHWVjwDIkK3MWESdWS4tI89FoblXn9&s=Ety3VhMg8aZcBncPPcPCS5XzUde9hjKVulkt8r7mD2k&e= >.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* The purpose of this test is to create a DWARF line table that contains two
    or more entries for the same line.  When stepping (forwards or backwards),

gdb/testsuite/gdb.reverse/map-to-same-line.exp

@@ -11,7 +11,7 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.gnu.org_licenses_&d=DwIDAg&c=jf_iaSHvJObTbx-siA1ZOg&r=RFEmMkZAk--_wFGN5tkM_A&m=hvslrRyYSFfiB2uOFjd7I62ZBKNJkGFWTdsHWVjwDIkK3MWESdWS4tI89FoblXn9&s=Ety3VhMg8aZcBncPPcPCS5XzUde9hjKVulkt8r7mD2k&e= >.
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # When stepping (forwards or backwards), GDB should step over the entire line
 # and not just a particular entry in the line table. This test was added to