cmd/geth: remove trailing newline in license command (#15782)

cmd/geth/misccmd.go

@@ -134,7 +134,6 @@ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
-along with geth. If not, see <http://www.gnu.org/licenses/>.
+along with geth. If not, see <http://www.gnu.org/licenses/>.`)
-`)
 	return nil
 }