Entry inside scroll container has incorrect mouse cursor on drag handles

[Jacalz]

Describe the bug:

Having an entry inside a scroll container leads to the mouse cursor being the text edit style when dragging over the drag handles for the scrolling. This seems incorrect and should possibly be changed to a drag style mouse.

To Reproduce:

Steps to reproduce the behaviour using example code:

1. Type something into the entry.
2. Drag using the drag handles.

Screenshots:

Example code:

package main

import (
	"fyne.io/fyne/app"
	"fyne.io/fyne/widget"
)

func main() {
	a := app.New()
	w := a.NewWindow("Scroll handles wrong")

	w.SetContent(widget.NewScrollContainer(widget.NewMultiLineEntry()))
	w.ShowAndRun()
}

Device (please complete the following information):

• OS: Solus (linux distro)
• Version: Linux Kernel 5.6.18
• Go version: 1.14.3
• Fyne version: 1.3.0

[andydotxyz]

Available on develop for testing