Simplify GUI: Remove video container dropdown, keep embed source images checkbox

- Remove redundant video_container_choice dropdown (was non-interactive with only MP4 option)
- Keep embed_source_images_choice checkbox with updated label 'Embed Source Images'
- Hardcode video_container to 'mp4' in configuration
- Clean up function parameters and references
- Streamline Outputs tab interface for better UX

Author: Gunther-Schulz

wgp.py

@@ -2990,7 +2990,6 @@ def apply_changes(  state,
                     max_frames_multiplier_choice = 1,
                     display_stats_choice = 0,
                     video_output_codec_choice = None,
-                    video_container_choice = None,
                     embed_source_images_choice = None,
                     image_output_codec_choice = None,
                     audio_output_codec_choice = None,
@@ -3030,7 +3029,7 @@ def apply_changes(  state,
         "max_frames_multiplier" : max_frames_multiplier_choice,
         "display_stats" : display_stats_choice,
         "video_output_codec" : video_output_codec_choice,
-        "video_container" : video_container_choice,
+        "video_container" : "mp4",  # Fixed to MP4 format
         "embed_source_images" : embed_source_images_choice,
         "image_output_codec" : image_output_codec_choice,
         "audio_output_codec" : audio_output_codec_choice,
@@ -9201,20 +9200,10 @@ def check(mode):
                     label="Video Codec to use"
                 )
 
-                video_container_choice = gr.Dropdown(
-                    choices=[
-                        ("MP4", 'mp4'),
-                    ],
-                    value="mp4",
-                    label="Video Container Format",
-                    interactive=False,
-                    info="MP4 format with embedded cover art for source images"
-                )
-
                 embed_source_images_choice = gr.Checkbox(
                     value=server_config.get("embed_source_images", False),
-                    label="Embed Source Images in Video Files",
-                    info="Automatically embeds i2v source images"
+                    label="Embed Source Images",
+                    info="Saves i2v source images inside MP4 files"
                 )
 
                 image_output_codec_choice = gr.Dropdown(
@@ -9305,7 +9294,6 @@ def check(mode):
                     max_frames_multiplier_choice,
                     display_stats_choice,
                     video_output_codec_choice,
-                    video_container_choice,
                     embed_source_images_choice,
                     image_output_codec_choice,
                     audio_output_codec_choice,