Explicitly close sqlite connection

The context manage on Connection only commit the connection but it should still
be explicitly closed.

Closes #13859
(grafted from b529128ca42c72ed76c0b19c71277f917488d05c)

--HG--
branch : 7.0

trytond/trytond/backend/sqlite/database.py

@@ -485,8 +485,8 @@ class Database(DatabaseInterface):
             path = os.path.join(config.get('database', 'path'),
                     database_name + '.sqlite')
         with sqlite.connect(path) as conn:
-            cursor = conn.cursor()
-            cursor.close()
+            conn.cursor()
+        conn.close()
 
     @classmethod
     def drop(cls, connection, database_name):

trytond/trytond/tests/test_tryton.py

@@ -165,19 +165,22 @@ def _sqlite_copy(file_, restore=False):
         finally:
             database.put_connection(connection, True)
 
-    with Transaction().start(DB_NAME, 0) as transaction, \
-            sqlite.connect(file_) as conn2:
+    with Transaction().start(DB_NAME, 0) as transaction:
         conn1 = transaction.connection
-        if restore:
-            conn2, conn1 = conn1, conn2
-        if hasattr(conn1, 'backup'):
-            conn1.backup(conn2)
-        else:
-            try:
-                import sqlitebck
-            except ImportError:
-                return False
-            sqlitebck.copy(conn1, conn2)
+        with sqlite.connect(file_) as conn2:
+            if restore:
+                in_, out = conn2, conn1
+            else:
+                in_, out = conn1, conn2
+            if hasattr(in_, 'backup'):
+                in_.backup(out)
+            else:
+                try:
+                    import sqlitebck
+                except ImportError:
+                    return False
+                sqlitebck.copy(in_, out)
+        conn2.close()
     return True