fix test for useReducer, simpleCounter example

[tsargent]

The code that looks for "commentLessLines" ends up filtering unintended lines . Counter.toString() returns this:

function Counter({
      initialCount = 0,
      step = 1
    }) {
      // 🐨 replace React.useState with React.useReducer.
      // 💰 React.useReducer(countReducer, initialCount)
      const [count, setCount] = React.useReducer(countReducer, initialCount); // 💰 you can write the countReducer function so you don't have to make any
      // changes to the next two lines of code! Remember:
      // The 1st argument is called "state" - the current value of count
      // The 2nd argument is called "newState" - the value passed to setCount
    
      const increment = () => setCount(count + step);
    
      return /*#__PURE__*/(0, _jsxDevRuntime.jsxDEV)("button", {
        onClick: increment,
        children: count
      }, void 0, false, {
        fileName: _jsxFileName,
        lineNumber: 18,
        columnNumber: 10
      }, this);
    }

As you can see, the non-comment code with React.useReducer is on a line that ends with a comment, but this whole line will be filtered out, and the test will fail. We might want to instead look for lines that begin with comments: l.trim().substr(0, 2).includes('//')

[kentcdodds]

Thanks! This test is pretty bad 😅

[kentcdodds]

@all-contributors please add @tsargent for tests

[allcontributors]

@kentcdodds

I've put up a pull request to add @tsargent! 🎉