Use precise species name for image file

There can be multiple species that end the same way, so using endswith is not guaranteed to get you the right images. This change makes sure the flux diagrams will map the correct species image onto the flux diagram.

Author: sevyharris

rmgpy/tools/fluxdiagram.py

@@ -208,7 +208,7 @@ def generate_flux_diagram(reaction_model, times, concentrations, reaction_rates,
             continue
         for root, dirs, files in os.walk(species_directory):
             for f in files:
-                if f.endswith(species_index):
+                if f == species_index:
                     image_path = os.path.join(root, f)
                     break
         if os.path.exists(image_path):