UI: Fix proptype for isToolshown

[curiouslychase]

isToolshown is a bool in all other proptype definitions and having it as a string causes a warning in the Layout.

Issue:

What I did

• changed the PropType for isToolshown from string to bool

How to test

Before:

• ran Storybook
• opened Chrome console
• observed the following:

Warning: Failed prop type: Invalid prop `options.isToolshown` of type `boolean` supplied to `Layout`, expected `string`.

After:

• ran Storybook
• opened Chrome console
• observed no warning.

rg 'isToolshown.*PropTypes' ui
ui/src/components/layout/mobile.js
207:    isToolshown: PropTypes.bool,

ui/src/components/layout/container.js
552:    isToolshown: PropTypes.string.isRequired,

ui/src/components/preview/preview.js
335:    isToolshown: PropTypes.bool,

ui/src/components/layout/desktop.js
66:    isToolshown: PropTypes.bool.isRequired,

[vercel]

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