Adapt test to change in pint 0.18

pint 0.18 introduced a change that breaks some of our unit tests.
See: hgrecco/pint#1407
Adapt the tests to work both with pint <=0.18

lib/taurus/qt/qtgui/display/test/test_tauruslabel.py

@@ -178,7 +178,7 @@ def _typeFormatter(dtype, **kwargs):
 @pytest.mark.parametrize(
     "model, fmt, fg",
     [
-        ("eval:1.2345", "{:.3f}", "1.234 dimensionless"),
+        ("eval:1.2345", "{:.3fP}", "1.234 dimensionless"),
         ("eval:1.2345", "{:~.3f}", "1.234"),
         ("eval:1.2345", "{:~.3f}", "1.234"),
         ("eval:1.2345", ">>{}<<", ">>1.2345<<"),
@@ -206,7 +206,7 @@ def test_instance_format(
 @pytest.mark.parametrize(
     "model, fmt, fg",
     [
-        ("eval:1.2345", "{:.3f}", "1.234 dimensionless"),
+        ("eval:1.2345", "{:.3fP}", "1.234 dimensionless"),
         ("eval:1.2345", "{:~.3f}", "1.234"),
         ("eval:1.2345", "{:~.3f}", "1.234"),
         ("eval:1.2345", ">>{}<<", ">>1.2345<<"),
@@ -228,7 +228,7 @@ def test_class_format(monkeypatch, qtbot, caplog, model, fmt, fg):
         qtbot.addWidget(w)
 
         w.setModel(model)
-        w.resetFormat()  # needed to avoid fuzzyness in the tests
+        w.resetFormat()  # needed to avoid fuzziness in the tests
 
         def _ok():
             """Check text"""