Removed debian patch for encoding in tests

The encoding is set in the source code now, so
the patch is no longer necessary.

debian/patches/00001-utf8_for_tests

@@ -1,26 +0,0 @@
-Description: Use utf8 encoding when loading tests
- Test files are encoded in utf8, normally Python3 uses locale settings
- and decodes, but this fails when building as locale is not set, and
- could also be set to some unexpected value.
- .
- relational (2.0-1) unstable; urgency=medium
- .
-   * New upstream release
-   * Now uses Python3
-   * Now uses PyQt5
-   * Bump standards version
-   * Recommends python3-pyqt5.qtwebkit to open the documentation from the UI but
-     it is not a necessity
-Author: Salvo 'LtWorf' Tomaselli <tiposchi@tiscali.it>
-
---- relational-2.0.orig/driver.py
-+++ relational-2.0/driver.py
-@@ -40,7 +40,7 @@ tests_path = 'test/'
- 
- def readfile(fname):
-     '''Reads a file as string and returns its content'''
--    fd = open(fname)
-+    fd = open(fname,encoding='utf-8')
-     expr = fd.read()
-     fd.close()
-     return expr

debian/patches/series

@@ -1 +0,0 @@
-00001-utf8_for_tests