Fix silly typo

Author: Numynum

.pkgmeta

@@ -5,4 +5,4 @@ externals:
     libs/CallbackHandler-1.0: https://repos.wowace.com/wow/ace3/trunk/CallbackHandler-1.0
     libs/LibDBIcon-1.0: https://repos.wowace.com/wow/libdbicon-1-0/trunk/LibDBIcon-1.0
     libs/LibDataBroker-1.1: https://github.com/tekkub/libdatabroker-1-1
-    libs/LibDropDownMenu: https://repos.curseforge.com/wow/libuidropdownmenu/trunk/LibUIDropDownMenu
+    libs/LibUIDropDownMenu: https://repos.curseforge.com/wow/libuidropdownmenu/trunk/LibUIDropDownMenu