dillon1000/react

More tests for fbt whitespace handling

I experimented with more variations but prettier collapses most of them: any run 
of consecutive whitespace within a jsxtext node will get collapsed into a single 
space, for example. So the main difference in practice is whether a jsxtext node 
(preceding a value) has a trailing space/newline or not: 

``` 

Text <fbt:param /> Text 

// vs 

Text<fbt:param />Text 

``` 

which we now have tests for.