fix msg diff test

Author: ochafik

common/chat.cpp

@@ -1469,8 +1469,8 @@ static void common_chat_parse_hermes_2_pro(common_chat_msg_parser & builder) {
     static const common_regex open_regex(
         "(?:"
             "(```(?:xml|json)?\\n\\s*)?" // match 1 (block_start)
-            "("                          // match 2 (open_tag)  
-                "<tool_call>"                   
+            "("                          // match 2 (open_tag)
+                "<tool_call>"
                 "|<function_call>"
                 "|<tool>"
                 "|<tools>"

tests/test-chat.cpp

@@ -1396,7 +1396,7 @@ static void test_msg_diffs_compute() {
         common_chat_msg_diff diff12;
         diff12.tool_call_index = 0;
         diff12.tool_call_delta.name = "special_function";
-        diff12.tool_call_delta.id = "123";
+        // Note: id doesnt change here.
         diff12.tool_call_delta.arguments = "g1\": 1}";
 
         assert_equals(