Pick New sprite option becomes unavailable if you change the view options

The Pick New sprite option becomes unavailable if you change the view options to either tile or column when working with the keyframes of a 2D animation. This issue affects the project indefinitely until a new project is made, changing the project settings or editor preferences back to default does not resolve this issue. This issue does not appear to be a regression.

Versions Tested: Issue occurs in all versions tested
4.17.2 - CL: 3658906
4.18.2 - CL: 3794801
4.19.0 - CL: 3813964

1. Create a new project using the 2D SIde scroller template
2. In the content folder navigate to the Running or idle animation and double-click to open one of them
3. In the animation viewer right click on any keyframe
4. In the options window that appears > select the view options
5. In the view options > under view type select either Tiles or Columns
   Result: Pick new sprite option is no longer available
   Expected Result: The pick new sprite option is still available

Fix UE-51650

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