Don't mess with NSLocale.currentLocale

It might not reflect the user's actual locale in `+load`, so let's do
the set up in `+initialize`.

src/Components/MRNavigationBarProgressView.m

@@ -50,7 +50,7 @@ @implementation MRNavigationBarProgressView
 
 static NSNumberFormatter *progressNumberFormatter;
 
-+ (void)load {
++ (void)initialize {
     NSNumberFormatter *numberFormatter = [NSNumberFormatter new];
     numberFormatter.numberStyle = NSNumberFormatterPercentStyle;
     numberFormatter.locale = NSLocale.currentLocale;