GravityView View Gutenberg Block: "Sort Field" Accepts Only Numeric Input

[bennemann]

The "Sort Field" in the block's "Extra Settings" should also accept strings:

That's important so people can sort by entry meta such as date_created and not only field IDs.

Ideally, this should be a field selector instead of a text input, like the one used to select the View in the Main Settings of the block.

[bennemann]

https://secure.helpscout.net/conversation/2578811951/54024/

[mrcasual]

@omarkasem,

1. The new select field is 10px taller than the similar View select field.
2. There is a border around the input text that shouldn't be there; please use the same style as the View select field:

[omarkasem]

@mrcasual All done with the latest commit