tree-wide: be more careful when passing literal integers to "t" bus message fields

tree-wide: be more careful when passing literal integers to "t" bus message fields

Since we use varargs for sd_message_append() we need to make sure the
parameters we pass are actually 64bit wide, if "t" is used. Hence cast
appropriately if necessary.

I went through the whole tree, and in most cases we got it right, but
there are some cases we missed so far.

Inspired by: #31420