Fix-use the real cursor position for tablet arrow keys

[Roniscend]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the ./gradlew lintKotlin detekt test command as directed in the testing section of the contributing guide

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Description

Reads the cursor position from getExtractedText() instead of getTextBeforeCursor(1000)
Fixes: #710

[andrewtavis]

praise: All's looking great here as well, @Roniscend! Amazing that we're also checking tablets! Would be really great if we could include them in the MVP release, so do report if you're finding more things that are problematic with them and make further issues 😊

[Roniscend]

praise: All's looking great here as well, @Roniscend! Amazing that we're also checking tablets! Would be really great if we could include them in the MVP release, so do report if you're finding more things that are problematic with them and make further issues 😊

Yeah for sure