fix magics history in two-process ipython console

Before this commit:
    In [1]: %hist
    get_ipython().magic(u'hist')

    In [2]: a?
    Object `a` not found.

    In [3]: hist
    get_ipython().magic(u'hist')
    get_ipython().magic(u'pinfo a')
    hist

After this commit:
    In [1]: %hist
    %hist

    In [2]: a?
    Object `a` not found.

    In [3]: hist
    %hist
    a?
    hist

closes #1114

IPython/frontend/terminal/console/interactiveshell.py

@@ -333,7 +333,7 @@ def interact(self, display_banner=None):
                     self.autoedit_syntax):
                     self.edit_syntax_error()
                 if not more:
-                    source_raw = self.input_splitter.source_reset()
+                    source_raw = self.input_splitter.source_raw_reset()[1]
                     hlen_b4_cell = self._replace_rlhist_multiline(source_raw, hlen_b4_cell)
                     self.run_cell(source_raw)