Allow tapping buffer lines when keyboard open

Without keyboardShouldPersistTaps, tapping a buffer line closes the
keyboard. This allows copying a line or clicking a link when the
keyboard is open.

src/usecase/buffers/ui/Buffer.tsx

@@ -188,6 +188,7 @@ export default class Buffer extends React.PureComponent<Props, State> {
         key={linesListKey}
         inverted
         keyboardDismissMode="interactive"
+        keyboardShouldPersistTaps="handled"
         keyExtractor={keyExtractor}
         renderItem={this.renderBuffer}
         initialNumToRender={initialNumToRender}