sql: remove PRAGMA "short_column_names"

The pragmas "short_column_names" and "full_column_names" allow us
to use three ways to display the column name in metadata:
1) If both are turned off, then the column name was shown as it
was written by the user.
2) If "short_column_names" = OFF and "full_column_names" = ON,
then the column name is displayed as <table name>.<column name>.
3) If "short_column_names" = ON, then the column name is displayed
as <column name>. This is the default option.

But we need only two ways to show the column name:
1) Show the column name as <column name>. This should be the
default option.
2) Show the column name as <table name>.<column name>.

In this regard, we need only one of these pragmas.

Part of #4511