CommonHostInterface: Update rumble every frame regardless of change

Fixes SDL rumble cutting off early when a game sends the same motor
strength values every frame over a long duration.

src/frontend-common/common_host_interface.cpp

@@ -1055,15 +1055,9 @@ void CommonHostInterface::UpdateControllerRumble()
     if (!controller)
       continue;
 
-    bool changed = false;
     for (u32 i = 0; i < rumble.num_motors; i++)
-    {
-      const float strength = controller->GetVibrationMotorStrength(i);
-      changed |= (strength != rumble.last_strength[i]);
-      rumble.last_strength[i] = strength;
-    }
+      rumble.last_strength[i] = controller->GetVibrationMotorStrength(i);
 
-    if (changed)
     rumble.update_callback(rumble.last_strength.data(), rumble.num_motors);
   }
 }
@@ -1072,14 +1066,9 @@ void CommonHostInterface::StopControllerRumble()
 {
   for (ControllerRumbleState& rumble : m_controller_vibration_motors)
   {
-    bool changed = false;
     for (u32 i = 0; i < rumble.num_motors; i++)
-    {
-      changed |= (rumble.last_strength[i] != 0.0f);
       rumble.last_strength[i] = 0.0f;
-    }
 
-    if (changed)
     rumble.update_callback(rumble.last_strength.data(), rumble.num_motors);
   }
 }

src/frontend-common/sdl_controller_interface.cpp

@@ -710,7 +710,7 @@ void SDLControllerInterface::SetControllerRumbleStrength(int controller_index, c
     return;
 
   // we'll update before this duration is elapsed
-  static constexpr u32 DURATION = 1000;
+  static constexpr u32 DURATION = 65535; // SDL_MAX_RUMBLE_DURATION_MS
 
 #if SDL_VERSION_ATLEAST(2, 0, 9)
   if (it->use_game_controller_rumble)