fix(kotlin): Change the default target name to es2015

Author: rjaros

vite-base/src/main/kotlin/config/ViteBuildConfig.kt

@@ -27,7 +27,7 @@ interface ViteBuildConfig {
 	 * ```kotlin
 	 * vite {
 	 *     build {
-	 *         target.set("modules")
+	 *         target.set("es2015")
 	 *     }
 	 * }
 	 * ```

vite-kotlin/src/main/kotlin/config/Defaults.kt

@@ -9,6 +9,6 @@ internal fun ViteConfig.defaultConfiguration() {
 	plugin("@rollup/plugin-commonjs", "commonjs", "28.0.6")
 
 	// Build
-	build.target.convention("modules")
+	build.target.convention("es2015")
 	build.modulePreload.convention(true)
 }