Fix: Keep the space between charger types in a condition summary

A charger condition naming more than one plug type read "While charging
via Wireless,Dock". The separator resource was authored as ", " but
Android strips leading and trailing whitespace from an unquoted string
resource, so the value reaching joinLabels() was a bare comma. Quoting
the resource preserves the space.

Author: d4rken

app/src/main/res/values/strings.xml

@@ -729,7 +729,8 @@
     <string name="rules_condition_bluetooth_unnamed">While a paired device is connected</string>
     <string name="rules_condition_charger">While charging via %1$s</string>
     <string name="rules_condition_charger_none">No charger type selected</string>
-    <string name="rules_condition_separator">, </string>
+    <!-- Quoted: Android strips trailing whitespace from an unquoted resource, which would join charger types as "Wireless,Dock". -->
+    <string name="rules_condition_separator">", "</string>
     <string name="rules_condition_unsupported">This device can\'t act on charger conditions.</string>
     <string name="rules_policy_unavailable">This charge mode isn\'t available on this device.</string>
     <string name="rules_failure_warning">The last change couldn\'t be applied. Amply keeps retrying.</string>