fix-HELM_INSTALL_DIR instead of $PATH in get-helm-3

Signed-off-by: liketosweep <liketosweep@gmail.com>

scripts/get-helm-3

@@ -267,9 +267,9 @@ fail_trap() {
 # testVersion tests the installed client to make sure it is working.
 testVersion() {
   set +e
-  HELM="$(command -v $BINARY_NAME)"
-  if [ "$?" = "1" ]; then
-    echo "$BINARY_NAME not found. Is $HELM_INSTALL_DIR on your "'$PATH?'
+  HELM="$HELM_INSTALL_DIR/$BINARY_NAME"
+  if [ ! -x "$HELM" ]; then
+    echo "$BINARY_NAME not found or not executable at $HELM_INSTALL_DIR/$BINARY_NAME"
     exit 1
   fi
   set -e