[RNMobile] Update Video caption placeholder color to match other placeholder text styles

[maxme]

Fixes wordpress-mobile/gutenberg-mobile#996

Description

Update Video caption placeholder color to match other placeholder text styles.

Note: I had a look at the image caption and it's not using the same component (RichText for images, TextInput for videos), I wonder if this must be updated in the video block. Also, I guess this part could be factorized.

How has this been tested?

Manually tested via https://github.com/wordpress-mobile/gutenberg-mobile

Screenshots

Types of changes

Style changes.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.

cc @hypest (I can't add you as a reviewer to that PR, I don't have permissions).

[hypest]

👋 @mchowning , can you add a review on this one? You recently worked on the caption for the Image block so this feels relevant.

[mchowning]

LGTM! 🚀

I had a look at the image caption and it's not using the same component (RichText for images, TextInput for videos), I wonder if this must be updated in the video block.

I think you're right and I didn't see any issues already tracking this, so I went ahead and opened wordpress-mobile/gutenberg-mobile#1244.

@maxme I'm not sure if you have the needed permissions to merge this yet. Just let me know if you don't and you'd like me to take care of that.

[maxme]

I think you're right and I didn't see any issues already tracking this, so I went ahead and opened wordpress-mobile/gutenberg-mobile#1244.

Perfect!

@maxme I'm not sure if you have the needed permissions to merge this yet. Just let me know if you don't and you'd like me to take care of that.

I don't, merge it for me please 🍾 🎉