libdnf: Use single-quotes around string literals used in SQL statements

libdnf: Use single-quotes around string literals used in SQL statements

If sqlite is built with -DSQLITE_DQS=0 in accordance with
https://sqlite.org/quirks.html#dblquote, migration to version 1.2 of the
history database would fail with:

  History database cannot be created: .../var/lib/dnf/history.sqlite.
  Error: SQLite error on ":memory:": Executing an SQL statement failed:
  no such column: 1.2

Signed-off-by: Peter Kjellerstedt <pkj@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>