Settings: Hide certain pages when we have no connection

This hides the "Notifications", "Security", "Accounts" and "Devices"
page from the settings if we have no connection. This can now happen
since the user is able to enter the full settings without being logged
in from the welcome page.

src/settings/NeoChatSettingsView.qml

@@ -44,6 +44,7 @@ KirigamiSettings.ConfigurationView {
                     connection: root.connection
                 };
             }
+            visible: root.connection !== null
         },
         KirigamiSettings.ConfigurationModule {
             moduleId: "security"
@@ -55,12 +56,14 @@ KirigamiSettings.ConfigurationView {
                     connection: root.connection
                 };
             }
+            visible: root.connection !== null
         },
         KirigamiSettings.ConfigurationModule {
             moduleId: "accounts"
             text: i18n("Accounts")
             icon.name: "preferences-system-users"
             page: () => Qt.createComponent("org.kde.neochat.settings", "AccountsPage")
+            visible: root.connection !== null
         },
         KirigamiSettings.ConfigurationModule {
             moduleId: "emoticons"
@@ -72,6 +75,7 @@ KirigamiSettings.ConfigurationView {
                     connection: root.connection
                 };
             }
+            visible: root.connection !== null
         },
         KirigamiSettings.SpellcheckingConfigurationModule {},
         KirigamiSettings.ConfigurationModule {
@@ -90,6 +94,7 @@ KirigamiSettings.ConfigurationView {
                     connection: root.connection
                 };
             }
+            visible: root.connection !== null
         },
         KirigamiSettings.ConfigurationModule {
             moduleId: "aboutNeochat"