build, msvc: Drop duplicated common\url.cpp source file

[hebasto]

After #29904, the common\url.cpp source file is included into the SOURCE_FILES by the msvc-autogen.py script.

Removes a compiler warning:

url.obj : warning LNK4006: "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl UrlDecode(class std::basic_string_view<char,struct std::char_traits<char> >)" (?UrlDecode@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V?$basic_string_view@DU?$char_traits@D@std@@@2@@Z) already defined in common_url.obj; second definition ignored [D:\a\bitcoin\bitcoin\build_msvc\libbitcoin_common\libbitcoin_common.vcxproj]

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[fanquake]

ACK 97a4ad5