change to use c str literal

stdlib/src/sqlite.rs

@@ -1026,7 +1026,7 @@ mod _sqlite {
                 name_cstring = name.to_cstring(vm)?;
                 name_cstring.as_ptr()
             } else {
-                b"main\0".as_ptr().cast()
+                c"main".as_ptr().cast()
             };
 
             let sleep_ms = (sleep * 1000.0) as c_int;
@@ -1035,7 +1035,7 @@ mod _sqlite {
             let target_db = target.db_lock(vm)?;
 
             let handle = unsafe {
-                sqlite3_backup_init(target_db.db, b"main\0".as_ptr().cast(), db.db, name_ptr)
+                sqlite3_backup_init(target_db.db, c"main".as_ptr().cast(), db.db, name_ptr)
             };
 
             if handle.is_null() {