In get script, use specified path to helm binary for helm version check

Signed-off-by: Steven Cipriano <cipriano@squareup.com>

scripts/get

@@ -94,7 +94,7 @@ checkDesiredVersion() {
 # if it needs to be changed.
 checkHelmInstalledVersion() {
   if [[ -f "${HELM_INSTALL_DIR}/${PROJECT_NAME}" ]]; then
-    local version=$(helm version -c | grep '^Client' | cut -d'"' -f2)
+    local version=$("${HELM_INSTALL_DIR}/${PROJECT_NAME}" version -c | grep '^Client' | cut -d'"' -f2)
     if [[ "$version" == "$TAG" ]]; then
       echo "Helm ${version} is already ${DESIRED_VERSION:-latest}"
       return 0