0.0 doesn't require special handling

Without this change, our tests against OTP master started failing since
the negative zero change was introduced, for example:
https://github.com/rabbitmq/rabbitmq-server/actions/runs/6141080013/job/16660857916

The warning (treated as error) is:
```
rabbit_numerical.erl:33:8: matching on the float 0.0 will no longer also match -0.0 in OTP 27. If you specifically intend to match 0.0 alone, write +0.0 instead.
```

Author: mkuratczyk

deps/rabbit_common/src/rabbit_numerical.erl

@@ -30,8 +30,6 @@
 %%       human-readable output, or compact ASCII serializations for floats.
 digits(N) when is_integer(N) ->
     integer_to_list(N);
-digits(0.0) ->
-    "0.0";
 digits(Float) ->
     {Frac1, Exp1} = frexp_int(Float),
     [Place0 | Digits0] = digits1(Float, Exp1, Frac1),