luci-base: move tools.webadmin to luci-compat

Signed-off-by: Jo-Philipp Wich <redacted>

diff --git a/modules/luci-base/luasrc/tools/webadmin.lua b/modules/luci-compat/luasrc/tools/webadmin.lua
similarity index 100%
rename from modules/luci-base/luasrc/tools/webadmin.lua
rename to modules/luci-compat/luasrc/tools/webadmin.lua