[lldb] Remove unused CommandReturnObject stack variable (NFC)

Per the title, the variable is unused.

(cherry picked from commit c1e9b90)

Author: JDevlieghere

lldb/source/Interpreter/CommandInterpreter.cpp

@@ -286,8 +286,6 @@ bool CommandInterpreter::GetRequireCommandOverwrite() const {
 void CommandInterpreter::Initialize() {
   LLDB_SCOPED_TIMER();
 
-  CommandReturnObject result(m_debugger.GetUseColor());
-
   LoadCommandDictionary();
 
   // An alias arguments vector to reuse - reset it before use...