Really fix color check for dependency scanning

The commit "Fix color check for dependency scanning" was meant to
disable color if CMAKE_COLOR_MAKEFILE was off.  It did remove use of the
activation option '--color' but it failed to make the default false when
the option was missing.  This commit corrects that.  See issue #9680.

Source/cmake.cxx

@@ -1475,7 +1475,7 @@ int cmake::ExecuteCMakeCommand(std::vector<std::string>& args)
       std::string homeOutDir;
       std::string startOutDir;
       std::string depInfo;
-      bool color = true;
+      bool color = false;
       if(args.size() >= 8)
         {
         // Full signature: