MainActivity: remove filters lowering quality

Telegram or any subsequent media consumer should lower the quality
itself, here we just do useless damage.

app/src/main/java/io/lowrespalmtree/harvestdawn/MainActivity.kt

@@ -249,7 +249,7 @@ class MainActivity : AppCompatActivity() {
                 "-i $videoPath -i $audioPath"
                 + " -filter_complex amix=duration=longest"
                 + " -preset ultrafast"
-                + " -c:v libx264 -crf 26 -vf scale=$width:trunc(ow/a/2)*2 -pix_fmt yuv420p"
+                + " -c:v mpeg4"  // -crf 26 -vf scale=$width:trunc(ow/a/2)*2 -pix_fmt yuv420p
                 + " $durationOpt -y $outputPath"
             )
             Log.d(TAG, "Calling FFmpeg with command: $command")