[effects] Use standard arrow cursor in Present Windows & Desktop Grid

The pointing finger cursor is used to show that a piece of text is a
clickable link, and it is inappropriate to use it in other contexts.
Regular UI elements that do something when single-clicked continue to
use the standard arrow cursor in other contexts, so let's follow that
convention in the Present Windows and Desktop Grid effects too.

BUG: 421928
FIXED-IN: 5.23

src/effects/desktopgrid/desktopgrid.cpp

@@ -610,7 +610,7 @@ void DesktopGridEffect::windowInputMouseEvent(QEvent* e)
             }
         }
         if (wasWindowMove || wasDesktopMove) { // reset pointer
-            effects->defineCursor(Qt::PointingHandCursor);
+            effects->defineCursor(Qt::ArrowCursor);
         } else { // click -> exit
             const int desk = posToDesktop(me->pos());
             if (desk > effects->numberOfDesktops())
@@ -1036,7 +1036,7 @@ void DesktopGridEffect::setup()
         return;
     if (!keyboardGrab) {
         keyboardGrab = effects->grabKeyboard(this);
-        effects->startMouseInterception(this, Qt::PointingHandCursor);
+        effects->startMouseInterception(this, Qt::ArrowCursor);
         effects->setActiveFullScreenEffect(this);
     }
     setHighlightedDesktop(effects->currentDesktop());

src/effects/presentwindows/presentwindows.cpp

@@ -1650,7 +1650,7 @@ void PresentWindowsEffect::setActive(bool active)
         }
 
         // Create temporary input window to catch mouse events
-        effects->startMouseInterception(this, Qt::PointingHandCursor);
+        effects->startMouseInterception(this, Qt::ArrowCursor);
         m_hasKeyboardGrab = effects->grabKeyboard(this);
         effects->setActiveFullScreenEffect(this);