KT-41425 Project can not be launched with Gradle runner

93a82060 introduced support of "delegate to Gradle" for Gradle-Kotlin.
This commit fixes an issue known as "Could not get unknown property
'sourceSets' for root project".

idea/idea-gradle/src/org/jetbrains/kotlin/idea/gradle/execution/KotlinGradleAppEnvProvider.kt

@@ -170,6 +170,7 @@ class KotlinGradleAppEnvProvider : GradleExecutionEnvironmentProvider {
 
     allprojects {
         afterEvaluate { project ->
+            if (project.path == gradlePath) {
                 def overwrite = project.tasks.findByName(runAppTaskName) != null
                 project.tasks.create(name: runAppTaskName, overwrite: overwrite, type: JavaExec) {
                     if (javaExePath) executable = javaExePath
@@ -202,6 +203,7 @@ class KotlinGradleAppEnvProvider : GradleExecutionEnvironmentProvider {
                 }
             }
         }
+    }
     """
             // @formatter:on
             return initScript