Remove unnecessary initializers for empty wxString

src/commands/CommandManager.cpp

@@ -1080,7 +1080,7 @@ wxString CommandManager::GetLabelWithDisabledAccel(const CommandListEntry *entry
 {
    wxString label = entry->label;
 #if 1
-   wxString Accel = "";
+   wxString Accel;
    do{
       if (!entry->key.empty())
       {
@@ -1253,7 +1253,7 @@ void CommandManager::TellUserWhyDisallowed( const wxString & Name, CommandFlag f
    wxString reason = _("There was a problem with your last action. If you think\nthis is a bug, please tell us exactly where it occurred.");
    // The default title string is 'Disallowed'.
    wxString title = _("Disallowed");
-   wxString helpPage ="";
+   wxString helpPage;
 
    auto missingFlags = flagsRequired & (~flagsGot );
    if( missingFlags & AudioIONotBusyFlag )

src/commands/CommandTargets.cpp

@@ -136,7 +136,7 @@ void LispyCommandMessageTarget::EndStruct(){
    Update( ")" );
 }
 void LispyCommandMessageTarget::AddItem(const wxString &value, const wxString &name){
-   wxString Padding = "";
+   wxString Padding;
    if( name.empty() )
       Update( wxString::Format( "%s%s\"%s\"", (mCounts.back()>0)?" ":"", Padding, Escaped(value)));
    else 

src/commands/Keyboard.cpp

@@ -77,7 +77,7 @@ wxString NormalizedKeyString::Display(bool usesSpecialChars) const
 
 NormalizedKeyString KeyEventToKeyString(const wxKeyEvent & event)
 {
-   wxString newStr = wxT("");
+   wxString newStr;
 
    long key = event.GetKeyCode();