Remove unnecessary middleman game.infocus

It does the same thing as key.isActive, so no need to make it a separate
variable.

desktop_version/src/Game.cpp

@@ -117,7 +117,6 @@ bool GetButtonFromString(const char *pText, SDL_GameControllerButton *button)
 void Game::init(void)
 {
     mutebutton = 0;
-    infocus = true;
     muted = false;
     musicmuted = false;
     musicmutebutton = 0;

desktop_version/src/Game.h

@@ -179,7 +179,6 @@ public:
     int jumppressed;
     int gravitycontrol;
 
-    bool infocus;
     bool muted;
     int mutebutton;
     bool musicmuted;

desktop_version/src/main.cpp

@@ -203,7 +203,6 @@ int main(int argc, char *argv[])
     graphics.init();
 
     game.init();
-    game.infocus = true;
 
     // This loads music too...
     graphics.reloadresources();
@@ -351,7 +350,6 @@ int main(int argc, char *argv[])
     }
 #endif
 
-    game.infocus = true;
     key.isActive = true;
     game.gametimer = 0;
 
@@ -425,7 +423,7 @@ void inline deltaloop()
     const float alpha = game.over30mode ? static_cast<float>(accumulator) / timesteplimit : 1.0f;
     graphics.alpha = alpha;
 
-    if (game.infocus)
+    if (key.isActive)
     {
         switch (game.gamestate)
         {
@@ -466,8 +464,6 @@ void inline deltaloop()
 
 void inline fixedloop()
 {
-    game.infocus = key.isActive;
-
     // Update network per frame.
     NETWORK_update();
 
@@ -501,7 +497,7 @@ void inline fixedloop()
         game.press_map = false;
     }
 
-    if(!game.infocus)
+    if(!key.isActive)
     {
         Mix_Pause(-1);
         Mix_PauseMusic();
@@ -605,11 +601,11 @@ void inline fixedloop()
     }
 
     //Screen effects timers
-    if (game.infocus && game.flashlight > 0)
+    if (key.isActive && game.flashlight > 0)
     {
         game.flashlight--;
     }
-    if (game.infocus && game.screenshake > 0)
+    if (key.isActive && game.screenshake > 0)
     {
         game.screenshake--;
         graphics.updatescreenshake();