refactor #853 Delete useless brackets.

Author: toastkidjp

app/build.gradle.kts

@@ -25,7 +25,7 @@ android {
     defaultConfig {
         applicationId = "jp.toastkid.yobidashi"
         minSdk = BuildTool.minSdk
-        targetSdk = (BuildTool.targetSdk)
+        targetSdk = BuildTool.targetSdk
 
         versionCode = Version.code
         versionName = Version.name