Correct sketchbook folder selection button text

The previous text used past tense, which is not appropriate for a button.

Author: per1234

arduino-ide-extension/src/browser/settings.tsx

@@ -507,7 +507,7 @@ export class SettingsComponent extends React.Component<SettingsComponent.Props,
     protected browseSketchbookDidClick = async () => {
         const uri = await this.props.fileDialogService.showOpenDialog({
             title: 'Select new sketchbook location',
-            openLabel: 'Chose',
+            openLabel: 'Choose',
             canSelectFiles: false,
             canSelectMany: false,
             canSelectFolders: true