Remove old floating mode leftovers

Clapper has now much simpler floating mode. This overcomplicated code is not needed anymore.

src/controls.js

@@ -47,7 +47,6 @@ class ClapperControls extends Gtk.Box
             'go-previous-symbolic',
             'go-next-symbolic'
         );
-        revealTracksButton.floatUnaffected = false;
         revealTracksButton.add_css_class('narrowbutton');
         this.buttonsArr.push(revealTracksButton);
         const tracksRevealer = new Revealers.ButtonsRevealer(
@@ -90,12 +89,6 @@ class ClapperControls extends Gtk.Box
         this.unfullscreenButton.connect('clicked', this._onUnfullscreenClicked.bind(this));
         this.unfullscreenButton.set_visible(false);
 
-        this.unfloatButton = this.addButton(
-            'preferences-desktop-remote-desktop-symbolic'
-        );
-        this.unfloatButton.connect('clicked', this._onUnfloatClicked.bind(this));
-        this.unfloatButton.set_visible(false);
-
         const keyController = new Gtk.EventControllerKey();
         keyController.connect('key-pressed', this._onControlsKeyPressed.bind(this));
         keyController.connect('key-released', this._onControlsKeyReleased.bind(this));
@@ -117,14 +110,6 @@ class ClapperControls extends Gtk.Box
         this.set_can_focus(isFullscreen);
     }
 
-    setFloatingMode(isFloating)
-    {
-        this.isMobile = null;
-
-        for(let button of this.buttonsArr)
-            button.setFloatingMode(isFloating);
-    }
-
     setLiveMode(isLive, isSeekable)
     {
         if(isLive)
@@ -147,7 +132,7 @@ class ClapperControls extends Gtk.Box
     {
         const button = (buttonIcon instanceof Gtk.Button)
             ? buttonIcon
-            : new Buttons.IconButton(buttonIcon);
+            : new Buttons.CustomButton({ icon_name: buttonIcon });
 
         if(!revealer)
             this.append(button);
@@ -528,12 +513,6 @@ class ClapperControls extends Gtk.Box
         root.unfullscreen();
     }
 
-    _onUnfloatClicked(button)
-    {
-        const clapperWidget = this.get_ancestor(Gtk.Grid);
-        clapperWidget.setFloatingMode(false);
-    }
-
     _onCheckButtonToggled(checkButton)
     {
         if(!checkButton.get_active())