fix preview not show up on loading

app/src/main/java/com/biganto/visual/roompark/presentation/screen/photo/util/Renderer.kt

@@ -91,6 +91,7 @@ class RendererThread(val context: Context, val surface: SurfaceTexture)
                         ) {
                             Timber.d(" onResourceReady $resource")
                             bmpCache[index] = resource
+                            isDirty = true
                         }
                     })
             }