<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="hello">Hello World, MainActivity!</string>
    <string name="app_name">Calculator</string>
    <string name="allowed_entry">1234567890i+-.()</string>

</resources>

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Calculator</string>
    <string name="allowed_entry">1234567890i+-.()</string>

</resources>

Remove an unused string resource
Remove an unused string resource

... I have no idea why this existed in the first place, I'm pretty sure it
has been there since the project was made. Git blame says its been there
since 7bf22f7592986ff4a24333e09c2b0269e66fa3a0, so it has been there since
before version controlled changes to this project.

I also have no idea how this stayed there this long.

Long story short, I have no idea about anything to do with this line, but I'm removing it.
