MAINT-6424 Reverted disabling of the "Delete preset" button

indra/newview/llfloaterdeleteprefpreset.cpp

@@ -53,8 +53,6 @@ BOOL LLFloaterDeletePrefPreset::postBuild()
 	getChild<LLButton>("cancel")->setCommitCallback(boost::bind(&LLFloaterDeletePrefPreset::onBtnCancel, this));
 	LLPresetsManager::instance().setPresetListChangeCallback(boost::bind(&LLFloaterDeletePrefPreset::onPresetsListChange, this));
 
-	onPresetsListChange(); // ensure that delete button is disabled when the list is empty
-
 	return TRUE;
 }