docking: Be more consistent in reducing the overlay layout space

We used different behavior depending on the state, but we can just be
consistent and reduce the vertical space used in the same way

docking.js

@@ -2306,17 +2306,13 @@ var DockManager = class DashToDockDockManager {
                     box.y1 += spacing;
 
                 box.y2 -= searchBox.get_height() + spacing;
-
-                if (!wsThumbnails && this.mainDock.position === St.Side.BOTTOM)
-                    box.y2 -= spacing;
+                box.y2 -= spacing;
             }
 
             return box;
         };
 
         const maybeAdjustBoxToDock = (state, box, spacing) => {
-            const initialRatio = box.get_width() / box.get_height();
-
             maybeAdjustBoxSize(state, box, spacing);
 
             if (this.mainDock.isHorizontal || this.settings.dockFixed)
@@ -2330,11 +2326,6 @@ var DockManager = class DashToDockDockManager {
             else if (this.mainDock.position === St.Side.RIGHT)
                 box.x2 -= preferredWidth;
 
-            // Reduce the box height too, to keep the initial proportions
-            const heightAdjustment = (preferredWidth / initialRatio) / 2;
-            box.y1 += heightAdjustment;
-            box.y2 -= heightAdjustment;
-
             return box;
         };