don't incorrectly ask for CAMERA permission

app/src/main/AndroidManifest.xml

@@ -33,6 +33,9 @@
     <!-- Needed to open our bluetooth connection to our paired device (after reboot) -->
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 
+    <!-- the xing library will try to bring this permission in but we don't want it -->
+    <uses-permission android:name="android.permission.CAMERA" tools:node="remove" />
+
     <uses-feature
         android:name="android.hardware.bluetooth_le"
         android:required="true" />

app/src/main/java/com/geeksville/mesh/ui/BTScanScreen.kt

@@ -57,7 +57,7 @@ data class BTScanEntry(val name: String, val macAddress: String, val bonded: Boo
 
 @Composable
 fun BTScanScreen() {
-    val context = ambient(ContextAmbient)
+    val context = ContextAmbient.current
 
     /// Note: may be null on platforms without a bluetooth driver (ie. the emulator)
     val bluetoothAdapter =