Fix white LIFE being created in some cases, such as from EXOT+NEUT

The default for v is -1, which gets interpreted as a GoL rule with all bits set. Now, it will default to builtin-type GOL when v is -1.

src/simulation/elements/LIFE.cpp

@@ -91,6 +91,8 @@ static int graphics(GRAPHICS_FUNC_ARGS)
 
 static void create(ELEMENT_CREATE_FUNC_ARGS)
 {
+	if (v == -1)
+		v = 0;
 	// * 0x200000: No need to look for colours, they'll be set later anyway.
 	bool skipLookup = v & 0x200000;
 	v &= 0x1FFFFF;