Use InnoDB and utf8mb4_unicode_ci in the patchtester too

[andrepereiradasilva]

Summary of Changes

Create patchtester tables with InnoDB and utf8mb4_unicode_ci.

Testing Instructions

1. Install patchtester beta 4 with this patch integrated on a joomla latest staging (clean install).
   com_patchtester-beta-4-ut8mb4.zip
2. Check if everything is working fine.

Observations

To not cause issues added a drop to existing tables first.
Not an expert in databases, so please check if anything more is needed.

[mbabker]

Two things:

1. The DROP TABLE query isn't needed. Updates between the beta tagged releases aren't fully supported right now, similar to the core CMS (that'll change after a stable tag, it's mostly because I didn't do SQL deltas as needed for other database changes).

2. The install script should now check for 3.5.0 as the minimum instead of 3.3.0 if we're going to add the utf8mb4 stuff, that's checked here.

[andrepereiradasilva]

done and done