sprites: touch up shotguns. (#1155)

PASG
- Palettization left some weirdly brightly saturated green pixels on highlights. Changed them to olive manually.
- Embiggened the arm slightly to better match the fist.
- Darkened the arm slightly on the A frame to better match the mugshot, etc..
- Made the flash a bit brighter in the inside and less spiky at the top, to minimize the impression of a single blotch of red.

DBSG
- Added more contrast to the hand and shells.
- Cleaned up some stray pixels on the right edge.
- Mad the flash shorter vertically and made the peaks a little inward following the path of the guns instead of shooting straight up from just in front of the muzzle.

buildcfg.txt

@@ -2359,7 +2359,7 @@ SHTGB0	-78	-40
 SHTGC0	-60	-25
 SHTGD0	-44	-39
 SHTFA0	-142	-98
-SHTFB0	-131	-87
+SHTFB0	-131	-90
 SOULA0	12	39
 SOULB0	12	39
 SOULC0	12	39
@@ -2407,7 +2407,7 @@ SHT2F0	-174	-106
 SHT2G0	-153	-111
 SHT2H0	-125	-116
 SHT2I0	-136	-104
-SHT2J0	-125	-93
+SHT2J0	-125	-98
 SGN2A0	22	14
 TLMPA0	12	79
 TLMPB0	12	79