luci-base: move the ucode-mod-math dependency to luci-app-ddns

With randomid() off math.rand(), luci-base has no ucode math user left.
The one remaining consumer in the tree is luci-app-ddns, whose ddns.uc
imports isnan() while its Makefile only declares +luci-base - it has been
getting the module transitively all along.

Declare it where it is used.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Julius Bairaktaris <julius@bairaktaris.de>

applications/luci-app-ddns/Makefile

@@ -12,7 +12,7 @@ PKG_LICENSE:=Apache-2.0
 PKG_MAINTAINER:=Ansuel Smith <ansuelsmth@gmail.com>
 
 LUCI_TITLE:=LuCI Support for Dynamic DNS Client (ddns-scripts)
-LUCI_DEPENDS:=+luci-base +ddns-scripts
+LUCI_DEPENDS:=+luci-base +ddns-scripts +ucode-mod-math
 
 include ../../luci.mk
 

modules/luci-base/Makefile

@@ -24,7 +24,6 @@ LUCI_DEPENDS:=\
 	+ucode-mod-log \
 	+ucode-mod-uci \
 	+ucode-mod-ubus \
-	+ucode-mod-math \
 	+ucode-mod-html \
 	+liblucihttp-ucode