refactor: setting of kotlin's jvmTarget

Author: erisu

templates/project/app/build.gradle

@@ -261,15 +261,13 @@ android {
     }
 
     if (cordovaConfig.IS_GRADLE_PLUGIN_KOTLIN_ENABLED) {
-        if (cordovaConfig.KOTLIN_JVM_TARGET == null) {
-            // If the value is null, fallback to JAVA_TARGET_COMPATIBILITY,
-            // as they generally should be equal
-            def javaTarget = JavaLanguageVersion.of(cordovaConfig.JAVA_TARGET_COMPATIBILITY)
-            cordovaConfig.KOTLIN_JVM_TARGET = javaTarget
-        }
+        // If KOTLIN_JVM_TARGET is null, fallback to JAVA_TARGET_COMPATIBILITY,
+        // as they generally should be equal
+        cordovaConfig.KOTLIN_JVM_TARGET = cordovaConfig.KOTLIN_JVM_TARGET ?:
+                cordovaConfig.JAVA_TARGET_COMPATIBILITY
 
         kotlinOptions {
-            jvmTarget = cordovaConfig.KOTLIN_JVM_TARGET
+            jvmTarget = JavaLanguageVersion.of(cordovaConfig.KOTLIN_JVM_TARGET)
         }
     }