SQLite table dumping compatibility improvements. - #4205

I was working through the retired Holiday machine at HackTheBox. I noticed that sqlmap was unable to dump some of the tables for SQLite backend. There were two reasons for this:

1. SQLite supports implicit datatypes in the create table definition. The regex in lib/core/common.py did not consider this, and was failing to parse the create table statement. The first patch fixes this. See below for a brief before and after example:

   [11:55:08] [INFO] testing connection to the target URL
   sqlmap resumed the following injection point(s) from stored session:
   ---
   Parameter: username (POST)
       Type: boolean-based blind
       Title: OR boolean-based blind - WHERE or HAVING clause (NOT)
       Payload: username=admin") OR NOT 8444=8444 AND ("NnOA"="NnOA&password=admin
   ---
   [11:55:08] [INFO] the back-end DBMS is SQLite
   back-end DBMS: SQLite
   [11:55:08] [INFO] retrieving the length of query output
   [11:55:08] [INFO] resumed: 54
   [11:55:08] [INFO] resumed: CREATE TABLE sessions (sid PRIMARY KEY, expired, sess)
   Database: SQLite_masterdb
   Table: sessions
   [0 columns]
   +--------+
   | Column |
   +--------+
   +--------+
   

   [11:34:37] [INFO] the back-end DBMS is SQLite
   back-end DBMS: SQLite
   [11:34:37] [INFO] retrieving the length of query output
   [11:34:37] [INFO] retrieved: 54
   [11:34:41] [INFO] retrieved: CREATE TABLE sessions (sid PRIMARY KEY, expired, sess)             
   Database: SQLite_masterdb
   Table: sessions
   [3 columns]
   +---------+------+
   | Column  | Type |
   +---------+------+
   | expired | TEXT |
   | sess    | TEXT |
   | sid     | TEXT |
   +---------+------+
   

2. When dumping a table that has more rows than CHECK_ZERO_COLUMNS_THRESHOLD an additional query is run. This query had the table name concatenated to db name, which was causing the query to fail and the column being filled with NULL values. As this is the same for each column, nothing is dumped from the table. The second patch addresses this by removing the db name.

Hope these are of some use.