[plugin tests] adds some more %{dep:file}

src/plugins/instantiate/tests/stdlib/test_config

-OPT: @PTEST_FILE@ -instantiate -print -check -then -ocode @PTEST_DIR@/result/@PTEST_NAME@.c -print -then -no-instantiate @PTEST_DIR@/result/@PTEST_NAME@.c -ocode="" -print
+OPT: @PTEST_FILE@ -instantiate -print -check -then -ocode @PTEST_RESULT@/@PTEST_NAME@.c -print -then -no-instantiate @PTEST_RESULT@/@PTEST_NAME@.c -ocode="" -print

src/plugins/instantiate/tests/string/test_config

-OPT: @PTEST_FILE@ -instantiate -print -check -then -ocode @PTEST_DIR@/result/@PTEST_NAME@.c -print -then -no-instantiate @PTEST_DIR@/result/@PTEST_NAME@.c -ocode="" -print
+OPT: @PTEST_FILE@ -instantiate -print -check -then -ocode @PTEST_RESULT@/@PTEST_NAME@.c -print -then -no-instantiate @PTEST_RESULT@/@PTEST_NAME@.c -ocode="" -print
\ No newline at end of file

src/plugins/markdown-report/tests/md/test_config

 PLUGIN: eva,inout,scope markdown_report
-CMD: @frama-c@ -eva @PTEST_FILE@ -mdr-gen md -mdr-date="now" -mdr-out @PTEST_DIR@/result/@PTEST_NAME@.@PTEST_NUMBER@.md
+CMD: @frama-c@ -eva @PTEST_FILE@ -mdr-gen md -mdr-date="now" -mdr-out @PTEST_RESULT@/@PTEST_NAME@.@PTEST_NUMBER@.md
 LOG: @PTEST_NAME@.@PTEST_NUMBER@.md