iidxhook: Fix diagonal tearing on textures on iidx18 and 19

Affects all games based on version 18 and 19 which includes
the chinese versions

This code is based on the toastertools implementation.
Credits to the original authors.

src/main/iidxhook4/dllmain.c

@@ -72,6 +72,7 @@ iidxhook4_setup_d3d9_hooks(const struct iidxhook_config_gfx *config_gfx)
     d3d9_config.device_adapter = config_gfx->device_adapter;
     /* Required for GOLD (and newer?) to not crash with NVIDIA cards */
     d3d9_config.iidx14_to_19_nvidia_fix = true;
+    d3d9_config.iidx18_and_19_diagonal_tearing_fix = config_gfx->diagonal_tearing_fix;
 
     if (config_gfx->monitor_check == 0) {
         log_info("Auto monitor check enabled");