Show that identifier found in function names

(cherry picked from commit 9f7a166c35)

servers/visual/shader_language.cpp

@@ -932,6 +932,7 @@ bool ShaderLanguage::_find_identifier(const BlockNode *p_block, const Map<String
 			if (r_type) {
 				*r_type = IDENTIFIER_FUNCTION;
 			}
+			return true;
 		}
 	}