Can not choose layer from disk in impact function wizard

[ismailsunni]

Problem

While testing for InaSAFE 5.0, I found out that I can't choose layer from disk due to unfinished refactoring (most probable). I got this error:

			
2018-06-13T21:42:47	1	Traceback (most recent call last):
			  File "/Users/ismailsunni/.qgis2/python/plugins/inasafe/safe/gui/tools/wizard/step_fc25_hazlayer_from_browser.py", line 66, in tvBrowserHazard_selection_changed
			    'hazard')
			  File "/Users/ismailsunni/.qgis2/python/plugins/inasafe/safe/gui/tools/wizard/wizard_step_browser.py", line 403, in get_layer_description_from_browser
			    layer, category, keywords))
			  File "/Users/ismailsunni/.qgis2/python/plugins/inasafe/safe/gui/tools/wizard/wizard_step_browser.py", line 185, in unsuitable_layer_description_html
			    imfunc = self.parent.step_fc_function.selected_function()
			AttributeError: 'WizardDialog' object has no attribute 'step_fc_function'

Expected Behaviour

It should work properly

Environment

• InaSAFE : 4.4
• QGIS : 2.18
• OS : MacOS

Proposed Solution

Fix the bad code in wizard_step_browser.py