fix UNIXFILENAME variable for the Linux desktop integreation (fdo#64707)

There was a mistage when merging the clean up.

Note that $(UNIXFILENAME.$*) is not correctly substituted if the variables are define
by another VAR.bla variables. This is why we need to hardcode the lowercase names here.

Change-Id: I9110083122175cdbd09baa0533d890a7ef6d8213

sysui/productlist.mk

@@ -13,8 +13,8 @@ PKGVERSIONSHORT := $(LIBO_VERSION_MAJOR).$(LIBO_VERSION_MINOR)
 PRODUCTNAME.libreoffice := LibreOffice
 PRODUCTNAME.libreofficeodev := LibreOfficeDev
 PRODUCTNAME.oxygenoffice := OxygenOffice
-UNIXFILENAME.libreoffice := $(PRODUCTNAMELC.libreoffice)$(PKGVERSIONSHORT)
-UNIXFILENAME.libreofficedev := $(PRODUCTNAMELC.libreofficedev)$(PKGVERSIONSHORT)
-UNIXFILENAME.oxygenoffice := $(PRODUCTNAMELC.oxygenoffice)$(PKGVERSIONSHORT)
+UNIXFILENAME.libreoffice := libreoffice$(PKGVERSIONSHORT)
+UNIXFILENAME.libreofficedev := libreofficedev$(PKGVERSIONSHORT)
+UNIXFILENAME.oxygenoffice := oxygenoffice$(PKGVERSIONSHORT)
 
 # vim: set noet sw=4 ts=4: