Fix router matching utility in case matching with "startsWith" and searched part is inside of current url

[Olegas]

Issue: If the title of a story contains a word settings (i.e. Settings/Inner page/Inner component), resulted story page will have Controls tab all white and unclickable.
The reason it is overlapped with scrollbar components containers from the /settings route

storybook/lib/ui/src/app.tsx

Line 51 in ce10c0d

<Route path="/settings" startsWith>

The root cause @storybook/router's function getMatch

storybook/lib/router/src/utils.ts

Line 148 in d768373

export const getMatch = memoize(1000)(

The bug is inside condition - instead of failing fast if startsWith is set, we are going further and return on matchTarget

storybook/lib/router/src/utils.ts

Line 154 in d768373

if (startsWithTarget || currentIsTarget || matchTarget) {

What I did

Fix is applied to getMatch function

How to test

Tests are added to @storybook/router
To reproduce case visually, create a story with name contains Settings/ (i.e. Settings/Page/Component) and try to render it with essentials addon enabled

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[shilman]

@ndelangen mind taking a look at this one?