use 'pretty' version for package version

'pretty' (without `'v'` prefix) is what `composer show` outputs so have the
agent report that as package version.

--
Co-authored-by: Michael Fulbright <[email protected]>

Author: lavarou

agent/lib_composer.c

@@ -110,7 +110,11 @@ static void nr_execute_handle_autoload_composer_get_packages_information(
       = ""
         "(function() {"
         "  try {"
-        "      return \\Composer\\InstalledVersions::getVersion(\"%s\");"
+        "      $v = \\Composer\\InstalledVersions::getPrettyVersion(\"%s\");"
+        "      if ($v != null && strlen($v) > 0) {"
+        "          $v = ltrim($v, 'v');"
+        "      }"
+        "      return $v;"
         "  } catch (Exception $e) {"
         "      return NULL;"
         "  }"