sprites: fix TROO* alignment when flipped (Sodaholic)

Sodaholic writes:
>Due to the nature of the engine's sprite flipping, the Imp was often
>misaligned in many rotations, only way to fix it being to add
>horizontal "padding" to the image. So, that's just what I did. With
>this patch, the Imp will be correctly aligned when being viewed from
>angles 6-8.

DW: http://www.doomworld.com/vb/post/1052790
Signed-off-by: RjY <rjy@users.sourceforge.net>

buildcfg.txt

@@ -1772,26 +1772,26 @@ SPOSU0	24	17
 TROOA1	39	58
 TROOA2A8	23	61
 TROOA3A7	28	57
-TROOA4A6	27	52
+TROOA4A6	47	52
 TROOA5	22	48
 TROOB1	19	63
 TROOB2B8	22	64
-TROOB3B7	19	61
-TROOB4B6	25	55
+TROOB3B7	58	61
+TROOB4B6	56	55
 TROOB5	16	52
 TROOC1	20	62
 TROOC2C8	26	62
-TROOC3C7	29	61
+TROOC3C7	37	61
 TROOC4C6	22	53
 TROOC5	30	49
 TROOD1	18	60
 TROOD2D8	19	61
-TROOD3D7	22	57
-TROOD4D6	25	56
+TROOD3D7	50	57
+TROOD4D6	53	56
 TROOD5	14	51
 TROOE1	28	61
-TROOE2E8	22	64
-TROOE3E7	20	64
+TROOE2E8	36	64
+TROOE3E7	40	64
 TROOE4E6	42	64
 TROOE5	32	66
 TROOF1	26	52
@@ -1800,14 +1800,14 @@ TROOF3F7	39	52
 TROOF4F6	44	52
 TROOF5	12	59
 TROOG1	24	56
-TROOG2G8	25	55
-TROOG3G7	24	58
+TROOG2G8	45	55
+TROOG3G7	63	58
 TROOG4G6	28	57
 TROOG5	47	54
 TROOH1	32	59
-TROOH2H8	24	63
-TROOH3H7	34	63
-TROOH4H6	36	59
+TROOH2H8	38	63
+TROOH3H7	53	63
+TROOH4H6	57	59
 TROOH5	31	53
 TROOI0	32	59
 TROOJ0	29	58