⚡ setup module browsing perf improvement

When a module descriptor file is found, do not dig anymore in subdirectories
2nd fix, should be better than previous one (4042a12d reverted with 5ebc290b)

setup/extensionsmap.class.inc.php

@@ -345,6 +345,10 @@ class iTopExtensionsMap
 							$oExtension->bVisible = $bVisible;
 							$this->AddExtension($oExtension);							
 						}
+
+						closedir($hDir);
+
+						return true; // we found a module, no more digging necessary !
 					}
 				}
 			}