Merge bitcoin/bitcoin#26244: build, msvc: Enable C4834 warning

f3e40c4 build, msvc: Enable C4834 warning (Hennadii Stepanov)

Pull request description:

  Since bitcoin/bitcoin#26189 our codebase is  C4834 warning free.

  See https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/c4834.

ACKs for top commit:
  sipsorcery:
    tACK f3e40c4.

Tree-SHA512: 2dd8fdb5d6c0d4eaf7ffec82039411963010ecea559adfe7e2b5587f467135bd665e0cef5c748e4d6d9ba3c2038d6a5c79980972884adbaaac3bda3b2fbbc408

Author: fanquake

build_msvc/common.init.vcxproj.in

@@ -88,7 +88,7 @@
       <WarningLevel>Level3</WarningLevel>
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
       <AdditionalOptions>/utf-8 /Zc:__cplusplus /std:c++20 %(AdditionalOptions)</AdditionalOptions>
-      <DisableSpecificWarnings>4018;4244;4267;4334;4715;4805;4834</DisableSpecificWarnings>
+      <DisableSpecificWarnings>4018;4244;4267;4334;4715;4805</DisableSpecificWarnings>
       <TreatWarningAsError>true</TreatWarningAsError>
       <PreprocessorDefinitions>_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;ZMQ_STATIC;NOMINMAX;WIN32;HAVE_CONFIG_H;_CRT_SECURE_NO_WARNINGS;_SCL_SECURE_NO_WARNINGS;_CONSOLE;_WIN32_WINNT=0x0601;_WIN32_IE=0x0501;WIN32_LEAN_AND_MEAN;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\..\src;..\..\src\minisketch\include;..\..\src\univalue\include;..\..\src\secp256k1\include;..\..\src\leveldb\include;..\..\src\leveldb\helpers\memenv;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>