Colibre icons: fix links.txt link and update addwatch icon

Change-Id: Iddb48d2cde206824f7721c5f4374166cc4979ad9
Reviewed-on: https://gerrit.libreoffice.org/57272
Tested-by: Jenkins
Reviewed-by: andreas_kainz <kainz.a@gmail.com>

icon-themes/colibre/links.txt

@@ -1055,8 +1055,8 @@ cmd/sc_insertslidefield.png cmd/sc_insertpagenumberfield.png
 cmd/sc_insertslidesfield.png cmd/sc_insertpagecountfield.png
 cmd/sc_insertslidetitlefield.png cmd/sc_inserttitlefield.png
 cmd/sc_insertfilefield.png cmd/sc_open.png
-cmd/sc_insertdatefielfix.png cmd/sc_datefield.png
-cmd/sc_insertdatefielvar.png cmd/sc_datefield.png
+cmd/sc_insertdatefieldfix.png cmd/sc_datefield.png
+cmd/sc_insertdatefieldvar.png cmd/sc_datefield.png
 cmd/sc_inserttimefieldfix.png cmd/sc_timefield.png
 cmd/sc_inserttimefieldvar.png cmd/sc_timefield.png