luci-base: move and rename ucitrack system.json

Move the json file to where it belongs.

Signed-off-by: Florian Eckert <redacted>

diff --git a/modules/luci-base/root/usr/share/ucitrack/system.json b/modules/luci-mod-system/root/usr/share/ucitrack/luci-mod-system-system.json
similarity index 100%
rename from modules/luci-base/root/usr/share/ucitrack/system.json
rename to modules/luci-mod-system/root/usr/share/ucitrack/luci-mod-system-system.json