t5302: modernize test formatting

Our style these days is to place the description and the opening quote
of the body on the same line as test_expect_success (if it fits), to
place the trailing quote on a line by itself after the body, and to use
tabs.  Since we're going to be making several significant changes to
this test, modernize the style to aid in readability of the subsequent
patches.

This patch should have no functional change.

Signed-off-by: brian m. carlson <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: bk2204