refactor: remove redundant code from resolve_quickemu() (#1404)

* fix: remove redundant command call

* fix: test local quickemu is executable

quickget

@@ -3361,10 +3361,9 @@ function create_config() {
 
 # Use command -v command to check if quickemu is in the system's PATH and
 # fallback to checking if quickemu is in the current directory.
-function resolve_quickemu() {
-    if command -v quickemu >/dev/null 2>&1; then
-        command -v quickemu
-    elif [ -f "./quickemu" ]; then
+function resolve_quickemu() {   
+    command -v quickemu || \
+    if [ -x "./quickemu" ]; then
         echo "$(pwd)/quickemu"
     else
         echo "quickemu not found" >&2