[android, ui] lsfg: make "target frame rate" show/hide "frame multiplier" (#4274)

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4274
Reviewed-by: Samuel <lizzie@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsFragmentPresenter.kt

@@ -99,7 +99,12 @@ class SettingsFragmentPresenter(
 
             add(BooleanSetting.RENDERER_FRAME_GEN.key)
             add(IntSetting.RENDERER_FRAME_GEN_TARGET_RATE.key)
-            add(IntSetting.RENDERER_FRAME_GEN_MULTIPLIER.key)
+            if (IntSetting.RENDERER_FRAME_GEN_TARGET_RATE.getInt(
+                    getNeedsGlobalForKey(IntSetting.RENDERER_FRAME_GEN_TARGET_RATE.key)
+                ) == 0
+            ) {
+                add(IntSetting.RENDERER_FRAME_GEN_MULTIPLIER.key)
+            }
             add(IntSetting.RENDERER_FRAME_GEN_QUEUE_TARGET.key)
             add(BooleanSetting.RENDERER_FRAME_GEN_FLOW_SCALE_AUTO.key)
             if (!BooleanSetting.RENDERER_FRAME_GEN_FLOW_SCALE_AUTO.getBoolean(