clang-format: update whitespace penalty

clang-format-15 seems to end up with a slightly different whitespace
break than clang-format-14 did.  Tweak the PenaltyBreakAssignment
to favor not breaking as often, which allows the two to be more
consistent.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I49826e2011bce317b6b82dc985ddd35fa6eef2cb
diff --git a/example/asio-example.cpp b/example/asio-example.cpp
index 0b23e50..f113dd3 100644
--- a/example/asio-example.cpp
+++ b/example/asio-example.cpp
@@ -297,10 +297,10 @@
     }
 
     // test async method call and async send
-    auto mesg =
-        conn->new_method_call("xyz.openbmc_project.ObjectMapper",
-                              "/xyz/openbmc_project/object_mapper",
-                              "xyz.openbmc_project.ObjectMapper", "GetSubTree");
+    auto mesg = conn->new_method_call("xyz.openbmc_project.ObjectMapper",
+                                      "/xyz/openbmc_project/object_mapper",
+                                      "xyz.openbmc_project.ObjectMapper",
+                                      "GetSubTree");
 
     static const auto depth = 2;
     static const std::vector<std::string> interfaces = {