fixed button group appearance in settings

terminus-settings/src/components/settingsTab.component.pug

@@ -18,7 +18,7 @@ ngb-tabset.vertical(type='tabs')
                     .form-group
                         label Show tabs
                         br
-                        div(
+                        .btn-group(
                             '[(ngModel)]'='config.store.appearance.tabsLocation',
                             (ngModelChange)='config.save()',
                             ngbRadioGroup
@@ -41,7 +41,7 @@ ngb-tabset.vertical(type='tabs')
                     .form-group
                         label Window frame
                         br
-                        div(
+                        .btn-group(
                             '[(ngModel)]'='config.store.appearance.frame'
                             '(ngModelChange)'='config.save(); config.requestRestart()'
                             ngbRadioGroup
@@ -74,7 +74,7 @@ ngb-tabset.vertical(type='tabs')
                             .form-group
                                 label Dock the terminal
                                 br
-                                div(
+                                .btn-group(
                                     '[(ngModel)]'='config.store.appearance.dock'
                                     '(ngModelChange)'='config.save(); docking.dock()'
                                     ngbRadioGroup

terminus-terminal/src/components/terminalSettingsTab.component.pug

@@ -178,7 +178,7 @@
             .form-group.mr-3
                 label Terminal background
                 br
-                div(
+                .btn-group(
                     '[(ngModel)]'='config.store.terminal.background',
                     (ngModelChange)='config.save()',
                     ngbRadioGroup
@@ -201,7 +201,7 @@
             .form-group
                 label Cursor shape
                 br
-                div(
+                .btn-group(
                     [(ngModel)]='config.store.terminal.cursor',
                     (ngModelChange)='config.save()',
                     ngbRadioGroup
@@ -251,7 +251,7 @@
             .form-group.mr-3
                 label Terminal bell
                 br
-                div(
+                .btn-group(
                     '[(ngModel)]'='config.store.terminal.bell',
                     (ngModelChange)='config.save()',
                     ngbRadioGroup
@@ -281,7 +281,7 @@
             .form-group
                 label Blink cursor
                 br
-                div(
+                .btn-group(
                     '[(ngModel)]'='config.store.terminal.cursorBlink',
                     (ngModelChange)='config.save()',
                     ngbRadioGroup
@@ -316,7 +316,7 @@
         .form-group
             label Auto-open a terminal on app start
             br
-            div(
+            .btn-group(
                 '[(ngModel)]'='config.store.terminal.autoOpen',
                 (ngModelChange)='config.save()',
                 ngbRadioGroup