Change error loading script template to warning - not to show an exception...

because it is not an exception e.g. in case of using old gradle

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/KotlinScriptConfigurationManager.kt

@@ -100,7 +100,7 @@ class KotlinScriptConfigurationManager(
     fun getAllLibrarySourcesScope() = NonClasspathDirectoriesScope(getAllLibrarySources())
 
     private fun reloadScriptDefinitions() {
-        (makeScriptDefsFromTemplateProviderExtensions(project, { ep, ex -> log.error("[kts] Error loading definition from ${ep.id}", ex) }) +
+        (makeScriptDefsFromTemplateProviderExtensions(project, { ep, ex -> log.warn("[kts] Error loading definition from ${ep.id}", ex) }) +
          loadScriptConfigsFromProjectRoot(File(project.basePath ?: "")).map { KotlinConfigurableScriptDefinition(it, kotlinEnvVars) }).let {
             if (it.isNotEmpty()) {
                 scriptDefinitionProvider.setScriptDefinitions(it + StandardScriptDefinition)