scripted-diff: disable unimplemented ArgsManager BOOL/INT/STRING flags

This commit does not change behavior in any way. See previous commit for
complete rationale, but these flags are being disabled because they
aren't implemented and will otherwise break backwards compatibility when
they are implemented.

-BEGIN VERIFY SCRIPT-
sed -i 's:\(ALLOW_.*\)   \(//!< unimplemented\):// \1\2:' src/util/system.h
sed -i '/DISALLOW_NEGATION.*scripted-diff/d' src/util/system.cpp
git grep -l 'ArgsManager::ALLOW_\(INT\|STRING\)'  | xargs sed -i 's/ArgsManager::ALLOW_\(INT\|STRING\)/ArgsManager::ALLOW_ANY | ArgsManager::DISALLOW_NEGATION/g'
git grep -l 'ALLOW_BOOL' -- ':!src/util/system.h' | xargs sed -i 's/ALLOW_BOOL/ALLOW_ANY/g'
-END VERIFY SCRIPT-

src/util/system.cpp

@@ -652,7 +652,6 @@ void ArgsManager::AddArg(const std::string& name, const std::string& help, unsig
 
     LOCK(cs_args);
     std::map<std::string, Arg>& arg_map = m_available_args[cat];
-    if ((flags & (ALLOW_ANY | ALLOW_BOOL)) == 0) flags |= DISALLOW_NEGATION; // Temporary, removed in next scripted-diff
     auto ret = arg_map.emplace(arg_name, Arg{name.substr(eq_index, name.size() - eq_index), help, flags});
     assert(ret.second); // Make sure an insertion actually happened