scripts: Always return '2' when skipping tests

runtime.bash always returns 2 (or 77 in one case) when a test is
skipped. But two cases are missed and return 0. Fix them.

Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Link: https://patch.msgid.link/20251110232642.633672-2-yosry.ahmed@linux.dev
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: yosrym93

scripts/runtime.bash

@@ -103,13 +103,13 @@ function run()
 
     if [ -z "$GEN_SE_HEADER" ] && find_word "pv-host" "$groups"; then
         print_result "SKIP" $testname "" "no gen-se-header available for pv-host test"
-        return
+        return 2
     fi
 
     if [ -z "$only_group" ] && find_word nodefault "$groups" &&
             skip_nodefault; then
         print_result "SKIP" $testname "" "test marked as manual run only"
-        return;
+        return 2
     fi
 
     if [ -n "$arch" ] && [ "$arch" != "$ARCH" ]; then