[util] Add configs for Delta Force Xtreme 1 & 2

Prevents the games from black screening on Alt-Tab and helps big performance dips.

src/util/config/config.cpp

@@ -883,6 +883,12 @@ namespace dxvk {
     { R"(\\ninthdawnii\.exe$)", {{
       { "d3d9.deferSurfaceCreation",        "True" },
     }} },
+    /* Delta Force: Xtreme 1 & 2                 *
+     * Black screen on Alt-Tab and performance   */
+    { R"(\\(DFX|dfx2)\.exe$)", {{
+      { "d3d9.deviceLossOnFocusLoss",       "True" },
+      { "d3d9.cachedDynamicBuffers",        "True" },
+    }} },
 
 
     /**********************************************/