Rerun clang-format on the repo (#1217)

🚨 clang-format changes output per version!

This is with version 19.0.0. The modifications seem to be fixing the old
version’s errors - mainly involving omitted whitespace around binary ops
and inserted whitespace between goto labels and colons (if followed by a
curly brace.)

Also fixes a few mistakes made by e.g. someone (ahem) forgetting to pass
his ctl/string.h modifications through it.

We should add this to .git-blame-ignore-revs once we have its final hash
on master.

test/ctl/optional_test.cc

@@ -117,7 +117,14 @@ main()
     }
 
     {
-        struct A { int* p = &g; A() {++*p; } };
+        struct A
+        {
+            int* p = &g;
+            A()
+            {
+                ++*p;
+            }
+        };
         ctl::optional<A> x;
         if (g != 0)
             return 25;