debugger: remove old disassembler view and handler

It is replaced by a real editor in e82d6c7b0.

src/plugins/debugger/script/scriptengine.h

@@ -98,7 +98,6 @@ private:
     void loadSymbols(const QString &moduleName);
     void loadAllSymbols();
     virtual QList<Symbol> moduleSymbols(const QString &moduleName);
-    void reloadDisassembler();
     void reloadModules();
     void reloadRegisters() {}
     void reloadSourceFiles() {}