helpers - fix sdl1 dependency installing on non RPi platforms.

In the past unsupported scriptmodules for a platform were not loaded, so rp_hasModule would only return true if the module was available for the platform.

As we now load all modules for displaying of information in retropie_setup / retropie_packages output, rp_hasModule function will return true, so we need to use rp_isEnabled instead.

This fixes installing scriptmodules with an sdl1.2-dev dependency on non RPi (eg x86/x11), that previously forced our custom sdl1 and then failed as it's disabled for the target.

scriptmodules/helpers.sh

@@ -227,10 +227,10 @@ function _mapPackage() {
             compareVersions "$__os_debian_ver" lt 9 && pkg="libpng12-dev"
             ;;
         libsdl1.2-dev)
-            rp_hasModule "sdl1" && pkg="RP sdl1 $pkg"
+            rp_isEnabled "sdl1" && pkg="RP sdl1 $pkg"
             ;;
         libsdl2-dev)
-            if rp_hasModule "sdl2"; then
+            if rp_isEnabled "sdl2"; then
                 # check whether to use our own sdl2 - can be disabled to resolve issues with
                 # mixing custom 64bit sdl2 and os distributed i386 version on multiarch
                 local own_sdl2=1