spelling: don't unnecessarily fiddle with the viewport

If we're somewhere deep into the file and do a spell check, and the
first misspelled word happens to be right there, onscreen already,
then this word does not need to be centered -- it /should/ not be
centered.  We should scroll only when necessary.

src/text.c

@@ -2650,7 +2650,6 @@ bool do_int_spell_fix(const char *word)
 #endif
     /* Otherwise, start from the top of the file. */
     {
-	openfile->edittop = openfile->fileage;
 	openfile->current = openfile->fileage;
 	openfile->current_x = 0;
     }