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xrow: add missing break statement

The old (7.5.0) GCC compiler leaves the following compilation warning
(leading to the error with `-Werror`):

NO_WRAP
```
src/box/xrow.c: In function ‘xrow_decode_call’:
src/box/xrow.c:1616:31: error: this statement may fall through [-Werror=implicit-fallthrough=]
    request->tuple_formats_end = data;
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
src/box/xrow.c:1617:3: note: here
   default:
   ^~~~~~~
cc1: all warnings being treated as errors
```
NO_WRAP

The missing statement is harmless since the `default` just does the same
thing, but to fix the error for old compilers and make the code cleaner,
the missing statement is added in this patch.

NO_DOC=cleanup
NO_TEST=cleanup
NO_CHANGELOG=cleanup

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