Wrap LLFloaterReg::toggleInstance() as well as showInstance() and hideInstance().

Use toggleInstance() in testfloaters.py.

indra/llui/llfloaterreglistener.cpp

@@ -27,6 +27,7 @@ LLFloaterRegListener::LLFloaterRegListener(const std::string& pumpName):
     requiredName["name"] = LLSD();
     add("showInstance", &LLFloaterRegListener::showInstance, requiredName);
     add("hideInstance", &LLFloaterRegListener::hideInstance, requiredName);
+    add("toggleInstance", &LLFloaterRegListener::toggleInstance, requiredName);
 }
 
 void LLFloaterRegListener::getBuildMap(const LLSD& event) const
@@ -58,3 +59,8 @@ void LLFloaterRegListener::hideInstance(const LLSD& event) const
 {
     LLFloaterReg::hideInstance(event["name"], event["key"]);
 }
+
+void LLFloaterRegListener::toggleInstance(const LLSD& event) const
+{
+    LLFloaterReg::toggleInstance(event["name"], event["key"]);
+}

indra/llui/llfloaterreglistener.h

@@ -29,6 +29,7 @@ class LLFloaterRegListener: public LLDispatchListener
     void getBuildMap(const LLSD& event) const;
     void showInstance(const LLSD& event) const;
     void hideInstance(const LLSD& event) const;
+    void toggleInstance(const LLSD& event) const;
 };
 
 #endif /* ! defined(LL_LLFLOATERREGLISTENER_H) */