libc: Make dbgln() also print a newline in userspace

Previously, dbgln() only printed a newline in kernel-space.

libc/src/stdio.cpp

@@ -84,4 +84,5 @@ void debug_log_impl(const char* format, va_list ap)
 {
     pure_cstyle_format(
         format, [](char c, void*) { console_write(&c, 1); }, nullptr, ap);
+    console_write("\n", 1);
 }