Fix missing import.

Author: rkistner

demos/android-supabase-todolist/src/main/java/com/powersync/androidexample/screens/SignInScreen.kt

@@ -6,6 +6,7 @@ import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.text.input.PasswordVisualTransformation
 import androidx.compose.ui.unit.dp
 import com.powersync.demos.AuthViewModel