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/list-users.cpp b/example/list-users.cpp
index f7ab475..4dabd40 100644
--- a/example/list-users.cpp
+++ b/example/list-users.cpp
@@ -13,9 +13,9 @@
     using namespace sdbusplus;
 
     auto b = bus::new_default_system();
-    auto m =
-        b.new_method_call("org.freedesktop.login1", "/org/freedesktop/login1",
-                          "org.freedesktop.login1.Manager", "ListUsers");
+    auto m = b.new_method_call("org.freedesktop.login1",
+                               "/org/freedesktop/login1",
+                               "org.freedesktop.login1.Manager", "ListUsers");
     auto reply = b.call(m);
 
     using return_type =