autotest: update fg_plane_view.sh for FlightGear 3.0

Tools/autotest/fg_plane_view.sh

@@ -8,7 +8,6 @@ nice fgfs \
     --aircraft=Rascal110-JSBSim \
     --control=mouse \
     --fg-aircraft="$AUTOTESTDIR/aircraft" \
-    --disable-intro-music \
     --airport=YKRY \
     --geometry=650x550 \
     --bpp=32 \
@@ -22,7 +21,6 @@ nice fgfs \
     --disable-ai-models \
     --fog-disable \
     --disable-specular-highlight \
-    --disable-skyblend \
     --disable-anti-alias-hud \
     --wind=0@0 \
     $*