Simplify drag icon hotspot setting

Having a non-computed hotspot is a hangover from when each map had its
own icons.

src/photini/imagelist.py

@@ -269,11 +269,7 @@ def mouseMoveEvent(self, event):
             finally:
                 del paint
         drag.setPixmap(icon)
-        if self.app.image_list.drag_hotspot:
-            x, y = self.app.image_list.drag_hotspot
-        else:
-            x, y = src_w // 2, src_h
-        drag.setHotSpot(QtCore.QPoint(x, y + margin))
+        drag.setHotSpot(QtCore.QPoint(src_w // 2, src_h + margin))
         mimeData = QtCore.QMimeData()
         mimeData.setData(DRAG_MIMETYPE, repr(paths).encode('utf-8'))
         drag.setMimeData(mimeData)
@@ -565,9 +561,8 @@ def __init__(self, parent=None):
         self.size_slider.valueChanged.connect(self._new_thumb_size)
         bottom_bar.addWidget(self.size_slider)
 
-    def set_drag_to_map(self, icon, hotspot=None):
+    def set_drag_to_map(self, icon):
         self.drag_icon = icon
-        self.drag_hotspot = hotspot
 
     def get_image(self, path):
         for image in self.images:

src/photini/photinimap.py

@@ -269,9 +269,9 @@ def __init__(self, parent=None):
         self.app = QtWidgets.QApplication.instance()
         self.app.loggerwindow.hide_word(self.api_key)
         self.script_dir = os.path.join(os.path.dirname(__file__), 'data', 'map')
-        self.drag_icon = self.app.map_icon_factory.get_pin_as_pixmap(True, False)
+        self.drag_icon = self.app.map_icon_factory.get_pin_as_pixmap(
+            True, False)
         w, h = self.app.map_icon_factory.get_pin_size(True)
-        self.drag_hotspot = w // 2, h
         self.search_string = None
         self.map_loaded = 0     # not loaded
         self.marker_info = {}
@@ -446,7 +446,7 @@ def set_icon_data(self):
         self.redraw_markers(force=True)
 
     def refresh(self):
-        self.app.image_list.set_drag_to_map(self.drag_icon, self.drag_hotspot)
+        self.app.image_list.set_drag_to_map(self.drag_icon)
         selection = self.app.image_list.get_selected_images()
         self.update_display(selection, adjust_map=False)
         if self.map_loaded < 1: