fix: update pp mode in tab store

[yueny2020]

Problem

• update pp mode in tab store

Solution

• The pp mode is per tab and every time the pp mode change needs to update the tab store. Then use the pp mode in tab store for ui display.

Test

Before change: the pp mode is cross tab and doesn't align with the pp mode toggle button.

• In Tab1, the pp mode = off. Then click add new tab button, the Tab2 was created with pp mode = on, but the code block still showed insert-to-cursor.

Tab1:

Tab2:

After change: the pp mode is per tab and align with the pp mode toggle button.

• In Tab1, the pp mode = off. Then click add new tab button, the Tab2 was created with pp mode = on, but the code block did NOT showed insert-to-cursor.

Tab1:

Tab2

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[laileni-aws]

LGTM.
For context pp = pair programming mode.