Update ComposeDemoAction.kt to remove unused imports (#3738)

examples/intellij-plugin/src/main/kotlin/com/jetbrains/compose/ComposeDemoAction.kt

@@ -8,9 +8,6 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material.Surface
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.awt.ComposePanel
-import androidx.compose.ui.layout.Layout
-import androidx.compose.ui.layout.MeasurePolicy
-import androidx.compose.ui.layout.onGloballyPositioned
 import com.intellij.openapi.actionSystem.AnActionEvent
 import com.intellij.openapi.project.DumbAwareAction
 import com.intellij.openapi.project.Project
@@ -21,9 +18,7 @@ import com.jetbrains.compose.widgets.LazyScrollable
 import com.jetbrains.compose.widgets.Loaders
 import com.jetbrains.compose.widgets.TextInputs
 import com.jetbrains.compose.widgets.Toggles
-import java.awt.Dimension
 import javax.swing.JComponent
-import javax.swing.SwingUtilities
 
 
 /**