Fix a minor test file locking issue on Windows.

FossilOrigin-Name: 6cd70b71df5c0d45412081590316bced302ec4403d565250b56e611882204821

test/memdb1.test

@@ -84,7 +84,6 @@ do_test 152 {
   catchsql {INSERT INTO t1 VALUES(3,4);}
 } {1 {attempt to write a readonly database}}
 
-breakpoint
 do_test 160 {
   db deserialize -maxsize 32768 $db1
   db eval {SELECT * FROM t1}
@@ -248,6 +247,7 @@ if {[wal_is_capable]} {
   set fd [open test.db]
   fconfigure $fd -translation binary -encoding binary
   set data [read $fd [expr 20*1024]]
+  close $fd
   
   sqlite3 db ""
   db deserialize $data