Update tour navigation dots and button to use theme's primary color

[eecavanna]

On this branch, I made two changes:

1. Update the color of the navigation dots in the tour popup, so they use the app theme's primary color (instead of the NPM package's default color, which was a different shade of blue)
2. Update the "Dismiss" button on the final step of the tour, so it matches the other buttons in the app (specifically, so its background color is the app theme's primary color)

Here are before-and-after screenshots:

Before

• Left: iOS
• Right: Android

Light palette

I think I didn't notice the dot's blue shade before because the app theme's primary color was not present in the popup (out of sight, out of mind).

Dark palette

I think I didn't notice the dot's blue shade before because the app theme's primary color was not present in the popup (out of sight, out of mind).

After

• Left: iOS
• Right: Android

Light palette

Dark palette

[eecavanna]

I consider the change to the dot color to be a "fix". It is an issue that I didn't know existed until I made the button use the app theme's primary color and saw the two shades of blue next to one another.

I consider the change to the "Dismiss" button color to be arbitrary (not necessarily a "fix"). In hindsight, I could go either way on it (i.e. keeping it blue—like most, if not all, of the other buttons in the app—or reverting to the light gray background).

[pkalita-lbl]

Definitely an improvement!