[lldb] Fix another GCC build failure in ScriptedPythonInterface.h

In 6c961ae, I've introduced a new explicit fully specialized templated method
`ScriptedPythonInterface::ReverseTransform(bool&, PythonObject, Status&)`.

However, that explicit specialization is causing GCC to choke when
building the file as shown here:

https://lab.llvm.org/buildbot/#/builders/217/builds/20430

To address that issue, this patch turns the method explicit specialization
into an method overload.

Differential Revision: https://reviews.llvm.org/D149218

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

lldb/source/Plugins/ScriptInterpreter/Python/ScriptedPythonInterface.h

@@ -146,7 +146,7 @@ protected:
     original_arg = ExtractValueFromPythonObject<T>(transformed_arg, error);
   }
 
-  template <>
+
   void ReverseTransform(bool &original_arg,
                         python::PythonObject transformed_arg, Status &error) {
     python::PythonBoolean boolean_arg = python::PythonBoolean(