Improve initial and minimum widths of resizable toolbars.

In particular, device toolbar previously could be made ridiculously small.
Also in the default configuration it takes a whole line, so we now use that space in its initial size.

Mixer Toolbar initial size was a little small.  Now it matches the Transport Toolbar width.
Meter Toolbar initial size was too small.
Transcription Toolbar was a little too small.  Better to start out slightly wider than previously.

src/toolbars/DeviceToolBar.h

@@ -44,9 +44,9 @@ class DeviceToolBar final : public ToolBar {
    void OnChoice(wxCommandEvent & event);
 
    /// When the prefs don't exist this value is used.
-   /// It should be small enough to work on tiny screens
-   int GetInitialWidth()  override{ return 620; }
-   int GetMinToolbarWidth() override { return 200; }
+   /// 883 takes a complete row in the default initial size of Audacity.
+   int GetInitialWidth()  override{ return 883; }
+   int GetMinToolbarWidth() override { return 350; }
 
    void ShowInputDialog();
    void ShowOutputDialog();

src/toolbars/MixerToolBar.h

@@ -39,6 +39,7 @@ class MixerToolBar final : public ToolBar {
    void Repaint(wxDC * WXUNUSED(dc)) override {};
    void EnableDisableButtons() override {};
    int GetMinToolbarWidth() override { return 250; }
+   int GetInitialWidth()  override { return 327; }
 
    void OnFocus(wxFocusEvent &event);
    void OnCaptureKey(wxCommandEvent &event);

src/toolbars/ToolBar.cpp

@@ -522,8 +522,8 @@ void ToolBar::ReCreateButtons()
       // Initial size at least as big as minimum.
       if( sz3.y < sz2.y )
          sz3.y = sz2.y;
-      if( sz3.x < sz2.x )
-         sz3.x = GetInitialWidth();
+      //if( sz3.x < sz2.x )
+      sz3.x = GetInitialWidth();
       //sz.SetWidth();
       SetSize(sz3);
    }

src/toolbars/TranscriptionToolBar.h

@@ -82,6 +82,7 @@ class TranscriptionToolBar final : public ToolBar {
    void Repaint(wxDC * WXUNUSED(dc)) override {};
    void EnableDisableButtons() override;
    void UpdatePrefs() override;
+   int GetInitialWidth()  override { return 191; }
    int GetMinToolbarWidth() override { return 125; }
 
    void OnFocus(wxFocusEvent &event);