Bundled themes: add initial-scale to viewport meta

[mukesh27]

Related: #61988

The viewport meta tags for themes from Twenty Eleven to Twenty Fifteen do not set the initial-scale value.

[sabernhardt]

Adds initial-scale=1 for Twenty Eleven to Twenty Fifteen, removes space in Twenty Twenty's viewport meta tag

[sabernhardt]

I used 1 for consistency with most of the other themes. Twenty Twenty uses 1.0, which I kept, but I wanted to remove the extra space.

Additional props from #61988: kkmuffme, SergeyBiryukov

[sabernhardt]

uses 1.0 instead of 1 for each viewport meta tag

[sabernhardt]

In case the value of 1.0 is preferred, I uploaded a patch to update existing tags to that value, too.

[dhruvang21]

Hi @sabernhardt,

I’ve applied your patch to add the initial scale in the viewport across all themes. Additionally, I’ve implemented the changes in the core file as mentioned by @SergeyBiryukov in the core ticket: #61988.

Would it be appropriate to include the core file changes in this PR, or should they be handled in a separate PR related to the ticket #61988?

[sabernhardt]

I prefer to have separate commits for editing theme files, but it is not imperative. If I write the theme changelog updates, I am already aware of the general ticket #61988.

If you want everything in one pull request:

1. You could update the Trac link in your PR summary to point to the first ticket instead.
2. The _default_wp_die_handler() function has another viewport tag in wp-includes/functions.php​ that could include initial-scale.

[dhruvang21]

Updated the track link in the PR Summary and added initial-scale in the viewport.

[sabernhardt]

Duplicate of #61988.

Thanks! I'll close this ticket as a duplicate then.

Thanks for the PR! Merged in r59026 and 59027.