d_drawlist: shadow fix

dDlst_shadowControl_c::reset() is called every frame, dDlst_shadowControl_c::init() is not. Fix up dDlst_shadowControl_c::init() to not leak and reset its own data when needed, and remove texture reset calls which tear down the texobj.

include/d/d_drawlist.h

@@ -310,6 +310,9 @@ private:
     /* 0x03410 */ dDlst_shadowReal_c mReal[8];
     /* 0x15EB0 */ TGXTexObj mShadowTexObj[2];
     /* 0x15EF0 */ void* mShadowTexData[2];
+    #if TARGET_PC
+    int mTexResScale;
+    #endif
 };
 
 class dDlst_window_c {