Use linear filtering

Anisotropic filtering makes no sense for scrcpy use case.

This (semantically) reverts 9e328ef98b.

app/src/scrcpy.c

@@ -60,9 +60,9 @@ sdl_init_and_configure(bool display) {
         return true;
     }
 
-    // Use the best available scale quality
-    if (!SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "2")) {
-        LOGW("Could not enable bilinear filtering");
+    // Linear filtering
+    if (!SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "1")) {
+        LOGW("Could not enable linear filtering");
     }
 
 #ifdef SCRCPY_SDL_HAS_HINT_MOUSE_FOCUS_CLICKTHROUGH