Ensure that CHECK's expressions are wrapped in parentheses

[Weyzu]

An example table creation:

sqlite_orm::make_table(
	"user",
	sqlite_orm::make_column(
		"id",
		&core::entities::User::id,
		sqlite_orm::autoincrement(),
		sqlite_orm::primary_key()
	),
	sqlite_orm::make_column("main", &core::entities::User::is_main),
	sqlite_orm::check(sqlite_orm::in(&core::entities::User::is_main, {0, 1}))
)

Creates a CHECK statement which expression is not wrapped properly in parentheses, i.e.

CREATE TABLE 'user' ( 
	'id' INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL , 
	'main' INTEGER NOT NULL , 
	CHECK "main" IN (  0,  1 )
)

Proper CHECK syntax in this example would be CHECK ("main" IN ( 0, 1 )).

The following pull request makes a small change to fix this. As I'm not a regular here, the required change may be more sophisticated than what I'm proposing. Nevertheless, the fix should solve the issue for the mentioned case scenario.

[fnc12]

@Weyzu thank you. Let's wait builds and if everything is ok with them I shall merge this PR

[fnc12]

@Weyzu merged. Thank you. IDK why not all checks processed but it looks like ok to me.