[@mantine/date] TimeInput: fix the width of the am/pm input (#2172)

* [@mantine/date] TimeInput: Fix width of am/pm

The AM/PM label for `TimeInput` is getting reset to `auto` which causes
it to be around 200px wide. If the TimeInput's width is shrunk to make
it take up less extraneous space, that interior input bleeds outside of
the container width. It seems that if this `width: auto` is removed then
the input has a more reasonable size.

* Undo unintentional formatting change

src/mantine-dates/src/components/TimeInputBase/TimeInputBase.styles.ts

@@ -43,7 +43,6 @@ export default createStyles((theme, { size, hasValue }: TimeInputBaseStyles) =>
   },
 
   amPmInput: {
-    width: 'auto',
     textAlign: 'left',
   },
 }));