Remove extra unused imports.

Author: TadeasKriz

shared-ui/src/commonMain/kotlin/co.touchlab.droidcon/ui/FirstRunConferenceSelector.kt

@@ -1,8 +1,6 @@
 package co.touchlab.droidcon.ui
 
-import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
-import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -20,7 +18,6 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Dialog
 import co.touchlab.droidcon.domain.entity.Conference
-import co.touchlab.droidcon.ui.theme.DroidconTheme
 
 @Composable
 fun FirstRunConferenceSelector(