issue: https://linear.app/comm/issue/ENG-3049/fix-tabs-header-container
In D6734 I missed the fact that `Tabs` was also used in some modals. This made them display incorrectly - not like in our designs. This diff fixes that by applying different styles based on a
flag passed as a prop. I dodn't create a separate component, because they would differ in only two lines. Instead, I change the css they use, like we do in `NavigationPanel`.
Before fix:
{F390903}
{F390904}
After fix:
{F390908}
{F390909}
And the tabs in chat still styled according to the new designs:
{F390907}
Here are the tabs on commit d6865be7150cb1e2c63bfd64faf03c34af842163, before my changes that introduces the bug:
{F390910}