swupdate-lualoader: Set SECTION to devel/lua

Having an empty SECTION = "" causes packaging failures with rpm:
| DEBUG: Executing shell function BUILDSPEC
| error: line 6: Empty tag: Group:

Fix packaging by setting a SECTION

Signed-off-by: Erik Schumacher <erik.schumacher@iris-sensing.com>

recipes-lua/swupdate-lualoader/swupdate-lualoader_1.0.bb

@@ -1,6 +1,6 @@
 SUMMARY = "Loader for swupdate"
 LICENSE = "MIT"
-SECTION = ""
+SECTION = "devel/lua"
 DEPENDS = "lua"
 LIC_FILES_CHKSUM = "file://${WORKDIR}/swupdate_handlers.lua;md5=354cf4af377edd962d2e8d78085d3ed7;beginline=1;endline=19"