Fix render progress framebuffer never being deleted

src/main/java/com/replaymod/render/gui/progress/VirtualWindow.java

@@ -1,6 +1,7 @@
 package com.replaymod.render.gui.progress;
 
 import com.replaymod.render.mixin.MainWindowAccessor;
+import de.johni0702.minecraft.gui.function.Closeable;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.gl.Framebuffer;
 import net.minecraft.client.util.Window;
@@ -9,7 +10,7 @@ import net.minecraft.client.util.Window;
 //$$ import net.minecraft.client.gl.WindowFramebuffer;
 //#endif
 
-public class VirtualWindow {
+public class VirtualWindow implements Closeable {
     private final MinecraftClient mc;
     private final Window window;
     private final MainWindowAccessor acc;
@@ -40,6 +41,11 @@ public class VirtualWindow {
         //#endif
     }
 
+    @Override
+    public void close() {
+        guiFramebuffer.delete();
+    }
+
     public void bind() {
         gameWidth = acc.getFramebufferWidth();
         gameHeight = acc.getFramebufferHeight();

src/main/java/com/replaymod/render/rendering/VideoRenderer.java

@@ -363,6 +363,8 @@ public class VideoRenderer implements RenderInfo {
         // Tear down of the timeline player might only happen the next tick after it was cancelled
         timelinePlayer.onTick();
 
+        guiWindow.close();
+
         // FBOs are always used in 1.14+
         //#if MC<11400
         //$$ if (!OpenGlHelper.isFramebufferEnabled()) {