Thriving land text template changed

Oracle text for Thriving lands that enter tapped and allow you to choose a color as they enter changed from being two lines to being phrased as a single item;

e.g.

From:

```
Thriving Moor enters the battlefield tapped.

As Thriving Moor enters the battlefield, choose a color other than black.
```

To:

```
This land enters tapped. As it enters, choose a color other than X.
```

I attempted to fix this text generation by chaining the choose effect off of the enters-tapped ability with a `.setText()` override, but per #15967 this did not work as expected. The additional effect never presented on the rules generated, nor did it kick in.

Need to dig a bit into:
* Why this didn't work as expected
* Also fixing the rule templating to align as originally attempted

Start by reviewing the failed attempt to chain the choose effect from the enters-tapped ability with a .setText() override, then read issue #15967 for the related behavior. Trace how Thriving land rules text is generated and verify that the choose effect both appears in the generated rules and takes effect, using the single-item wording described here as the target.

Written by the indexing model from the issue text.