Change --obfuscate to be a string flag (#9342)

- Change --obfuscate to be a string flag instead of a string list flag,
  since it's only supposed to take one argument.

Author: perost

OMCompiler/Compiler/Script/CevalScriptBackend.mo

@@ -3372,7 +3372,7 @@ algorithm
   (_, builtin_p) := FBuiltin.getInitialFunctions();
   scode_p := SymbolTable.getSCode();
 
-  if not Flags.isConfigFlagSet(Flags.OBFUSCATE, "none") then
+  if not Flags.getConfigString(Flags.OBFUSCATE) == "none" then
     (scode_p, cls_name, _, _, obfuscate_map) := Obfuscate.obfuscateProgram(scode_p, cls_name);
   end if;
 
@@ -3394,7 +3394,7 @@ algorithm
     fail();
   end try;
 
-  if Flags.isConfigFlagSet(Flags.OBFUSCATE, "protected") then
+  if Flags.getConfigString(Flags.OBFUSCATE) == "protected" then
     flatModel := FlatModel.deobfuscatePublicVars(flatModel, obfuscate_map);
   end if;
 end runFrontEndWorkNF;

OMCompiler/Compiler/Util/Flags.mo

@@ -1422,7 +1422,7 @@ constant ConfigFlag SIMULATION = CONFIG_FLAG(151, "simulation",
   Gettext.gettext("Simulates the last model in the given Modelica file."));
 
 constant ConfigFlag OBFUSCATE = CONFIG_FLAG(152, "obfuscate",
-  NONE(), EXTERNAL(), STRING_LIST_FLAG({"none"}),
+  NONE(), EXTERNAL(), STRING_FLAG("none"),
   SOME(STRING_DESC_OPTION({
     ("none", Gettext.gettext("No obfuscation.")),
     ("protected", Gettext.gettext("Obfuscates everything except for public variables.")),