[zscript] Decompiler does not correctly handle if ... else with nested ifs

[lmichaelis]

Originally mentioned by @auronen in the GMC Discord (also see auronen/DecDat#2).

Original

func void B_SetNpcVisual (var C_NPC slf, var int gender, var string headMesh, var int faceTex, var int bodyTex, var int armorInstance)
{
	slf.aivar[AIV_Gender] = gender;

	Mdl_SetVisual (slf,"HUMANS.MDS");

	if (gender == MALE)
	{
               Mdl_SetVisualBody (slf,	"hum_body_Naked0", 	bodyTex,	0,			headMesh, 	faceTex,	0, 			armorInstance);
		
		if (slf.attribute[ATR_STRENGTH] < 50)
		{
			Mdl_SetModelScale		(slf, 0.9, 1, 1); 			//BREITE / Höhe / Tiefe
		};

		if (slf.attribute[ATR_STRENGTH] > 100)
		{
			Mdl_SetModelScale		(slf, 1.1, 1, 1);			//BREITE / Höhe / Tiefe
		};
	}
	else //gender == FEMALE
	{
		if (bodyTex >= 0) && (bodyTex <= 3) //MännerBodyTex angegeben
		{
			bodyTex = bodyTex + 4; // Females haben Variation 4-7 (Males 0-3)
		};
		Mdl_SetVisualBody (slf,	"Hum_Body_Babe0", 	bodyTex,	0,			headMesh, 	faceTex,  	0,			armorInstance);
	};
};

Decompiled

func void B_SETNPCVISUAL(var C_NPC SLF, var int GENDER, var string HEADMESH, var int FACETEX, var int BODYTEX, var int ARMORINSTANCE) {
    SLF.AIVAR[17] = GENDER;
    MDL_SETVISUAL(SLF, "HUMANS.MDS");
    if ((GENDER) == (MALE)) {
        MDL_SETVISUALBODY(SLF, "hum_body_Naked0", BODYTEX, 0, HEADMESH, FACETEX, 0, ARMORINSTANCE);
        if ((SLF.ATTRIBUTE[4]) < (50)) {
            MDL_SETMODELSCALE(SLF, 1063675494, 1065353216, 1065353216);
        };
        if ((SLF.ATTRIBUTE[4]) > (100)) {
            MDL_SETMODELSCALE(SLF, 1066192077, 1065353216, 1065353216);
        };
    };

    // -----------------------------------------------------
    if (((BODYTEX) >= (0)) && ((BODYTEX) <= (3))) {
        BODYTEX = (BODYTEX) + (4);
    };
    MDL_SETVISUALBODY(SLF, "Hum_Body_Babe0", BODYTEX, 0, HEADMESH, FACETEX, 0, ARMORINSTANCE);
}