GUI: add back to dialog module results. Power: exit from reboot view. (#477)

Co-authored-by: SG <who.just.the.doctor@gmail.com>

applications/gui/modules/dialog.c

@@ -50,6 +50,9 @@ static bool dialog_view_input_callback(InputEvent* event, void* context) {
         } else if(event->key == InputKeyRight) {
             dialog->callback(DialogResultRight, dialog->context);
             consumed = true;
+        } else if(event->key == InputKeyBack) {
+            dialog->callback(DialogResultBack, dialog->context);
+            consumed = true;
         }
     }
 

applications/gui/modules/dialog.h

@@ -12,6 +12,7 @@ typedef struct Dialog Dialog;
 typedef enum {
     DialogResultLeft,
     DialogResultRight,
+    DialogResultBack,
 } DialogResult;
 
 /* Dialog result callback type