Fix backslash escaping in a test

Author: JanJakes

tests/WP_SQLite_Driver_Tests.php

@@ -3194,7 +3194,7 @@ public function testTranslateLikeBinary() {
 		$this->assertQuery( 'INSERT INTO _tmp_table (name) VALUES (NULL);' );
 		$this->assertQuery( "INSERT INTO _tmp_table (name) VALUES ('special%chars');" );
 		$this->assertQuery( "INSERT INTO _tmp_table (name) VALUES ('special_chars');" );
-		$this->assertQuery( "INSERT INTO _tmp_table (name) VALUES ('special\\chars');" );
+		$this->assertQuery( "INSERT INTO _tmp_table (name) VALUES ('special\\\\chars');" );
 		$this->assertQuery( "INSERT INTO _tmp_table (name) VALUES ('aste*risk');" );
 		$this->assertQuery( "INSERT INTO _tmp_table (name) VALUES ('question?mark');" );