SCI: Fix uninitialized variable workaround for scene 510 (bug #3575570)

A non-zero value must be used in the uninitialized variable, otherwise
the prize is awarded twice. Fixes bug #3575570 - "SCI: QfG3: Both the
player and Yesufu are declared winners"

engines/sci/engine/workarounds.cpp

@@ -140,7 +140,7 @@ const SciWorkaroundEntry uninitializedReadWorkarounds[] = {
 	{ GID_QFG2,          260,   260,  0,            "jabbarS", "changeState",0x2d22,   -1, { WORKAROUND_FAKE,   0 } }, // During the thief's first mission (in the house), just before Jabbar is about to enter the house (where you have to hide in the wardrobe), bug #3040469, temps 1 and 2
 	{ GID_QFG2,          500,   500,  0,   "lightNextCandleS", "changeState",    -1,   -1, { WORKAROUND_FAKE,   0 } }, // Inside the last room, while Ad Avis performs the ritual to summon the genie - bug #3148418
 	{ GID_QFG2,           -1,   700,  0,                 NULL, "showSign",       -1,   10, { WORKAROUND_FAKE,   0 } }, // Occurs sometimes when reading a sign in Raseir, Shapeir et al - bugs #3272735, #3275413
-	{ GID_QFG3,          510,   510,  0,         "awardPrize", "changeState",    -1,    0, { WORKAROUND_FAKE,   0 } }, // Simbani warrior challenge, after throwing the spears and retrieving the ring - bug #3049435
+	{ GID_QFG3,          510,   510,  0,         "awardPrize", "changeState",    -1,    0, { WORKAROUND_FAKE,   1 } }, // Simbani warrior challenge, after throwing the spears and retrieving the ring - bug #3049435. Must be non-zero, otherwise the prize is awarded twice - bug #3575570.
 	{ GID_QFG3,          140,   140,  0,              "rm140", "init",       0x1008,    0, { WORKAROUND_FAKE,   0 } }, // when importing a character and selecting the previous profession - bug #3040460
 	{ GID_QFG3,          330,   330, -1,             "Teller", "doChild",        -1,   -1, { WORKAROUND_FAKE,   0 } }, // when talking to King Rajah about "Rajah" (bug #3036390, temp 1) or "Tarna" (temp 0), or when clicking on yourself and saying "Greet" (bug #3039774, temp 1)
 	{ GID_QFG3,          700,   700, -1,      "monsterIsDead", "changeState",    -1,    0, { WORKAROUND_FAKE,   0 } }, // in the jungle, after winning any fight, bug #3040624