[libcalamares] Adjust code to changed name

- renamed setting in the configuration file, but not in the code
 - add documentation to getters

src/libcalamares/Settings.cpp

@@ -207,7 +207,7 @@ Settings::Settings( const QString& settingsFilePath,
             m_doChroot = !requireBool( config, "dont-chroot", false );
             m_isSetupMode = requireBool( config, "oem-setup", !m_doChroot );
             m_disableCancel = requireBool( config, "disable-cancel", false );
-            m_dontCancel = requireBool( config, "dont-cancel", false );
+            m_dontCancel = requireBool( config, "disable-cancel-during-exec", false );
         }
         catch ( YAML::Exception& e )
         {

src/libcalamares/Settings.h

@@ -69,8 +69,9 @@ public:
      */
     bool isSetupMode() const { return m_isSetupMode; }
 
+    /** @brief Global setting of disable-cancel: can't cancel ever. */
     bool disableCancel() const;
-    
+    /** @brief Temporary setting of disable-cancel: can't cancel during exec. */
     bool dontCancel() const;
 
 private: