Changes

cosmetic: library/GTPv1C_Templates: remove extra indentation level

The extra first indentation level around 99% of the file just loses
space which makes it difficult to keep templates at an acceptable width.
Do similarly to what we already do in lots of other template files which
were added later than this one.

Change-Id: I87755ec0a9023e79fb5f7a40c6c1734dca44696b