[android] Fix nightly build download URLs (#3487)

It should work now, I hope.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3487
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Co-authored-by: PavelBARABANOV <pavelbarabanov94@gmail.com>
Co-committed-by: PavelBARABANOV <pavelbarabanov94@gmail.com>

src/android/app/src/main/java/org/yuzu/yuzu_emu/ui/main/MainActivity.kt

@@ -200,8 +200,7 @@ class MainActivity : AppCompatActivity(), ThemeProvider {
                 var artifact = tag
                 // Nightly builds have a slightly different format
                 if (NativeLibrary.isNightlyBuild()) {
-                    val splitTag = tag.split('.')
-                    artifact = splitTag.subList(1, splitTag.size - 1).joinToString(".")
+                    artifact = tag.substringAfter('.', tag)
                 }
                 downloadAndInstallUpdate(tag, artifact)
             }

src/android/app/src/main/jni/native.cpp

@@ -1776,7 +1776,7 @@ JNIEXPORT jstring JNICALL Java_org_yuzu_yuzu_1emu_NativeLibrary_getUpdateApkUrl(
 #endif
     }
 
-    const std::string apk_filename = fmt::format("Eden-Android-{}-{}.apk", version_str, variant);
+    const std::string apk_filename = fmt::format("Eden-Android-{}-{}.apk", artifact_str, variant);
     const std::string url = fmt::format("{}/{}/releases/download/{}/{}",
         std::string{Common::g_build_auto_update_website},
         std::string{Common::g_build_auto_update_repo},
@@ -1784,6 +1784,7 @@ JNIEXPORT jstring JNICALL Java_org_yuzu_yuzu_1emu_NativeLibrary_getUpdateApkUrl(
         apk_filename);
 
     env->ReleaseStringUTFChars(tag, version_str);
+    env->ReleaseStringUTFChars(artifact, artifact_str);
     env->ReleaseStringUTFChars(packageId, package_id_str);
     return env->NewStringUTF(url.c_str());
 }