Fix build error introduced in 1eae693

Recover FilePath in 71376b8

Author: VictoriousRaptor

Flow.Launcher.Plugin/Result.cs

@@ -265,6 +265,11 @@ public record PreviewInfo
             /// </summary>
             public IconDelegate PreviewDelegate { get; set; } = null;
 
+            /// <summary>
+            /// File path of the result. For third-party preview programs such as QuickLook.
+            /// </summary>
+            public string FilePath { get; set; } = null;
+
             /// <summary>
             /// Default instance of <see cref="PreviewInfo"/>
             /// </summary>