[clang-tidy][NFC] Remove ModernizeTidyModule::getModuleOptions

[carlosgalvezp]

Summary

Most of the options stated there are duplicated already in
the implementation of each check as a default value for
each option.

The only place where this is not the case is the nullptr
check. Move the default option there instead. Only the
HICPP guidelines alias this modernize check, and there is
nothing in the documentation that suggests it should have
a different default value than the main modernize check.

[Eugene.Zelenko]

But will be good idea to notify authors of checks if they are still active.

clang-tools-extra/clang-tidy/modernize/ModernizeTidyModule.cpp

void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
     CheckFactories.registerCheck<UseTrailingReturnTypeCheck>(
         "modernize-use-trailing-return-type");
     CheckFactories.registerCheck<UseTransparentFunctorsCheck>(
         "modernize-use-transparent-functors");
     CheckFactories.registerCheck<UseUncaughtExceptionsCheck>(
         "modernize-use-uncaught-exceptions");
     CheckFactories.registerCheck<UseUsingCheck>("modernize-use-using");
   }
-
-  ClangTidyOptions getModuleOptions() override {
-    ClangTidyOptions Options;
-    auto &Opts = Options.CheckOptions;
-    // For types whose size in bytes is above this threshold, we prefer taking a
-    // const-reference than making a copy.
-    Opts["modernize-loop-convert.MaxCopySize"] = "16";
-
-    Opts["modernize-loop-convert.MinConfidence"] = "reasonable";
-    Opts["modernize-loop-convert.NamingStyle"] = "CamelCase";
-    Opts["modernize-pass-by-value.IncludeStyle"] = "llvm";    // Also: "google".
-    Opts["modernize-replace-auto-ptr.IncludeStyle"] = "llvm"; // Also: "google".
-
-    // Comma-separated list of macros that behave like NULL.
-    Opts["modernize-use-nullptr.NullMacros"] = "NULL";
-    return Options;
-  }
 };
 
 // Register the ModernizeTidyModule using this statically initialized variable.
 static ClangTidyModuleRegistry::Add<ModernizeModule> X("modernize-module",
                                                        "Add modernize checks.");
 
 } // namespace modernize
 
 // This anchor is used to force the linker to link in the generated object file
 // and thus register the ModernizeModule.
 volatile int ModernizeModuleAnchorSource = 0;
 
 } // namespace clang::tidy

clang-tools-extra/clang-tidy/modernize/UseNullptrCheck.cpp

private:
   Expr *FirstSubExpr;
   bool PruneSubtree;
 };
 
 } // namespace
 
 UseNullptrCheck::UseNullptrCheck(StringRef Name, ClangTidyContext *Context)
     : ClangTidyCheck(Name, Context),
-      NullMacrosStr(Options.get("NullMacros", "")) {
+      NullMacrosStr(Options.get("NullMacros", "NULL")) {
   StringRef(NullMacrosStr).split(NullMacros, ",");
 }
 
 void UseNullptrCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
   Options.store(Opts, "NullMacros", NullMacrosStr);
 }
 
 void UseNullptrCheck::registerMatchers(MatchFinder *Finder) {