[processing] allow all field types as unique ID field in Mean coords alg

(cherry picked from commit 75269d6)

Author: alexbruy

python/plugins/processing/algs/qgis/MeanCoords.py

@@ -59,11 +59,14 @@ def defineCharacteristics(self):
         self.addParameter(ParameterVector(self.POINTS,
                                           self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY]))
         self.addParameter(ParameterTableField(self.WEIGHT,
-                                              self.tr('Weight field'), MeanCoords.POINTS,
-                                              ParameterTableField.DATA_TYPE_NUMBER, optional=True))
+                                              self.tr('Weight field'),
+                                              MeanCoords.POINTS,
+                                              ParameterTableField.DATA_TYPE_NUMBER,
+                                              optional=True))
         self.addParameter(ParameterTableField(self.UID,
-                                              self.tr('Unique ID field'), MeanCoords.POINTS,
-                                              ParameterTableField.DATA_TYPE_NUMBER, optional=True))
+                                              self.tr('Unique ID field'),
+                                              MeanCoords.POINTS,
+                                              optional=True))
 
         self.addOutput(OutputVector(MeanCoords.OUTPUT, self.tr('Mean coordinates')))