[android] move GENSHIN_SPOOF flag to genshinSpoof flavor (#3923)

The standard build was downloading the optimized APK and vice versa due to GENSHIN_SPOOF being incorrectly defined in the mainline flavor. This should resolve the issue.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3923
Reviewed-by: crueter <crueter@eden-emu.dev>

src/android/app/build.gradle.kts

@@ -192,12 +192,6 @@ android {
             manifestPlaceholders += mapOf("appNameBase" to "Eden")
             resValue("string", "app_name_suffixed", "Eden")
 
-            externalNativeBuild {
-                cmake {
-                    arguments.add("-DGENSHIN_SPOOF=ON")
-                }
-            }
-
             ndk {
                 abiFilters += listOf("arm64-v8a")
             }
@@ -209,6 +203,12 @@ android {
             resValue("string", "app_name_suffixed", "Eden Optimized")
             applicationId = "com.miHoYo.Yuanshen"
 
+            externalNativeBuild {
+                cmake {
+                    arguments.add("-DGENSHIN_SPOOF=ON")
+                }
+            }
+
             ndk {
                 abiFilters += listOf("arm64-v8a")
             }