sqlite3/tests: Remove invalid test_open_misuse test case

You can pass NULL to `sqlite3_open()` and it will open a private,
temporary on-disk database. Therefore, drop the broken test.

sqlite3/tests/compat/mod.rs

@@ -60,14 +60,6 @@ fn test_libversion_number() {
     }
 }
 
-#[test]
-fn test_open_misuse() {
-    unsafe {
-        let mut db = ptr::null_mut();
-        assert_eq!(sqlite3_open(ptr::null(), &mut db), SQLITE_MISUSE);
-    }
-}
-
 #[test]
 fn test_open_not_found() {
     unsafe {