FIX: SQLite Syntax Errors Failed Plugin Installation

- fixes #6 - thanks @PopovIG

Schema/Sqlite.php

@@ -10,34 +10,31 @@ function version_1(PDO $pdo)
 {
     /* CREATE DYNAMIC ITEMS FOR ONE GENERAL CONTACT - ITEM TYPE WILL BE VALIDATED IN FRONTEND */
     $pdo->exec('CREATE TABLE IF NOT EXISTS address_book_contacts_items (
-        id INT NOT NULL AUTO_INCREMENT,
+        id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
         item VARCHAR(30) NOT NULL,
         item_help TEXT,
         item_type TEXT NOT NULL,
         property_set TEXT,
-        position INT NOT NULL,
-        PRIMARY KEY(id)
+        position INT NOT NULL
     )');
 
     /* SAVE VALUES OF DYNAMIC ITEMS FOR THE CONTACT */
     $pdo->exec('CREATE TABLE IF NOT EXISTS address_book_contacts_contact (
-        contacts_id INT NOT NULL,
+        contacts_id INTEGER KEY NOT NULL,
         item_id INT NOT NULL,
         contact_item_value TEXT NOT NULL,
         updated_by_user_id INT NOT NULL,
         last_updated INTEGER NOT NULL,
-        FOREIGN KEY(item_id) REFERENCES address_book_contacts_items(id) ON DELETE CASCADE,
-        KEY(contacts_id)
+        FOREIGN KEY(item_id) REFERENCES address_book_contacts_items(id) ON DELETE CASCADE
     )');
 
     /* CREATE LINKS TO TASKS WITH CONTACTS */
     $pdo->exec('CREATE TABLE IF NOT EXISTS address_book_contacts_task_has_contact (
-        id INT NOT NULL AUTO_INCREMENT,
+        id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
         task_id INT NOT NULL,
         contacts_id INT NOT NULL,
         FOREIGN KEY(contacts_id) REFERENCES address_book_contacts_contact(contacts_id) ON DELETE CASCADE,
-        FOREIGN KEY(task_id) REFERENCES tasks(id) ON DELETE CASCADE,
-        PRIMARY KEY(id)
+        FOREIGN KEY(task_id) REFERENCES tasks(id) ON DELETE CASCADE
     )');
 
     /* ADD DEFAULTS FOR CONTACT ITEMS */