Update mapping.py

Altered reduced_style_mapping: added realism and symbolism, removed rococo and cubism

mapping.py

@@ -215,7 +215,6 @@ reduced_style_mapping = {
     'art nouveau': 10,
     'baroque': 12,
     'conceptual art': 19,
-    'cubism': 24,
     'expressionism': 32,
     'gothic': 39,
     'impressionism': 44,
@@ -225,9 +224,10 @@ reduced_style_mapping = {
     'pop-art': 97,
     'post-impressionism': 98,
     'renaissance': 109,
-    'rococo': 110,
+    'realism': 107,
     'romanticism': 112,
-    'surrealism': 121
+    'surrealism': 121,
+    'symbolism': 122
 }
 
 reverse_reduced_genre_mapping = {v: k for k, v in reduced_genre_mapping.items()}