remove whitespaces and unneeded code

openlp/core/lib/toolbar.py

@@ -28,8 +28,6 @@ Provide common toolbar handling for OpenLP
 """
 import logging
 
-from PyQt4 import QtCore, QtGui
-
 from openlp.core.lib import build_icon
 
 log = logging.getLogger(__name__)

openlp/core/ui/slidecontroller.py

@@ -432,9 +432,6 @@ class SlideController(QtGui.QWidget):
         self.display.imageManager = self.parent.renderManager.image_manager
         self.display.alertTab = self.alertTab
         self.display.setup()
-        self.SlidePreview.setFixedSize(
-            QtCore.QSize(self.settingsmanager.slidecontroller_image,
-            self.settingsmanager.slidecontroller_image / self.ratio))
         if self.isLive:
             self.display.addActions(
                 [self.previousItem,