Fix darkwave normalisation

beetsplug/lastgenre/aliases.yaml

@@ -44,7 +44,7 @@ world music:
     - world
 chillout:
     - chill[ -]*out
-darkwave:
+dark wave:
     - dark[ -]*wave
 downtempo:
     - down[ -]*beat

beetsplug/lastgenre/genres-tree.yaml

@@ -320,7 +320,7 @@
             - madchester
         - dance-punk
         - dance-rock
-        - darkwave
+        - dark wave
         - electroclash
         - electronicore
         - electropunk

beetsplug/lastgenre/genres.txt

@@ -353,10 +353,10 @@ danza
 danzón
 dark ambient
 dark cabaret
+dark wave
 dark pop
 darkcore
 darkstep
-darkwave
 de ascultat la servici
 de codru
 de dragoste

test/plugins/test_lastgenre.py

@@ -1064,8 +1064,8 @@ class TestAliases:
             ("chill", "chill"),
             ("chill out", "chillout"),
             ("chill-out", "chillout"),
-            ("dark wave", "darkwave"),
-            ("dark-wave", "darkwave"),
+            ("dark wave", "dark wave"),
+            ("dark-wave", "dark wave"),
             ("blues rock", "blues rock"),
             ("blues-rock", "blues rock"),
             ("folk-rock", "folk rock"),