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Many of the adjustments of the value of openfile->current_y appear to be
a holdover from the days when certain functions had to account for what
is now called STATIONARY scrolling mode, which depends on the value of
current_y.  Remove these adjustement where they are superfluous.

do_para_begin(), do_para_end(), and do_bracket_match() update the screen
through edit_redraw(), which uses either CENTERING or FLOWING scrolling
mode, so their setting of current_y is redundant and useless, as it will
be ignored and then overridden by the next call to reset_cursor().

findnextstr() is called by go_looking() [which calls edit_redraw(), see
above], and by do_replace_loop() and do_int_spell_fix(), which both call
edit_refresh(), which in this case only uses CENTERING scrolling mode
since focusing is TRUE.

(Additionally, the adjustments of current_y in findnextstr() and
do_bracket_match() use incorrect values when in softwrap mode.)

find_paragraph() doesn't need to save or restore current_y, because it
doesn't do any screen updates.  do_justify() calls edit_refresh() with
focusing set to TRUE, so it uses the CENTERING scrolling mode.

do_alt_speller() and do_formatter() do not need to save and restore
current_y, because they don't modify it in any way.

This addresses https://savannah.gnu.org/patch/?9197.