Fix iconProvider case in SaveScreenshot.json

Changed the "iconProvider" property value from "Image" to "image" in the `SaveScreenshot.json` file to ensure consistency in naming conventions. This change aligns with coding standards that prefer lowercase for such identifiers.

Author: gravity-api

src/G4.Plugins.Ui/Actions.Manifests/SaveScreenshot.json

@@ -15,7 +15,7 @@
 			"sequentialWorkflow": {
 				"$type": "Action",
 				"componentType": "task",
-				"iconProvider": "Image",
+				"iconProvider": "image",
 				"model": "ActionRuleModel"
 			}
 		}