Bug#36597 Testsuite "jp": Suspicious results for some tests using sjis

Problem: Extra new line appeared in jisx0208_sjis2.dat in a mistake, which
broke jp_convert_sjis and jp_select_sjis tests.
Fix: removing extra line

  mysql-test/suite/jp/std_data/jisx0208_sjis2.dat:
      removing wrong extra new line

  mysql-test/suite/jp/t/disabled.def:     
      activating disabled tests      

mysql-test/suite/jp/std_data/jisx0208_sjis2.dat

 \\\\\\\\\\\\\\\\\\\\
-

mysql-test/suite/jp/t/disabled.def

@@ -9,5 +9,3 @@
 #  Do not use any TAB characters for whitespace.
 #
 ##############################################################################
-jp_convert_sjis      : Bug#36597 Testsuite "jp": Suspicious results for some tests
-jp_select_sjis       : Bug#36597 Testsuite "jp": Suspicious results for some tests