core: fix off-by-one causing incorrect profile display

In commit 4724c88 get_plot_details_new was updated to pass an index
instead of the entry into plot_string. This means we are passing "i" to
plot_string after the final increment of the for loop, instead of
getting the entry[i] within the loop before the final increment. This
means if we are mousing over the far right of the graph, where the time
based break is not hit, we will end up passing an index equal to nr-2
instead of nr-3, which is intended to shave off the final two rows
containing data not useful to the display.

There are a handful of ways to fix this. This commit intends to be
consistent with stylistic choices made elsewhere in the project.

Signed-off-by: Josh Torres <torres.josh.j@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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