Fixed .pro file and simple bug in linux desktop mode

Sankore_3.1.pro

@@ -110,7 +110,7 @@ win32 {
    QMAKE_CXXFLAGS_RELEASE += /Od \
        /Zi
    QMAKE_LFLAGS_RELEASE += /DEBUG
-   UB_LIBRARY.path = DESTDIR
+   UB_LIBRARY.path = $$DESTDIR
    UB_I18N.path = $$DESTDIR/i18n
    UB_ETC.path = $$DESTDIR
    UB_THIRDPARTY_INTERACTIVE.path = $$DESTDIR/library

src/desktop/UBDesktopAnnotationController.cpp

@@ -855,7 +855,11 @@ void UBDesktopAnnotationController::updateMask(bool bTransparent)
 void UBDesktopAnnotationController::refreshMask()
 {
     if(mIsFullyTransparent
-            || UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Selector)
+            || UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Selector
+            || UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Eraser
+            || UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Pointer
+            || UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Pen
+            || UBDrawingController::drawingController()->stylusTool() == UBStylusTool::Marker)
     {
         updateMask(true);
     }