Add height style to Dropdown (instrument-selector)

[agent515]

Fix to #119

Add maxHeight: 300 style to div inside Dropdown instrument-selector

before: <div className="py-2" style={{ width: 180 }}> after: <div className="py-2" style={{ width: 180, maxHeight: 300 }}>

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[ritz078]

@all-contributors please add @agent515 for code

[allcontributors[bot]]

@ritz078

I've put up a pull request to add @agent515! :tada: