genres.txt: rm fake genres

see issue #943; deleted all suggestions except 'early music' which some people may want/find meaningful

beetsplug/lastgenre/genres.txt

@@ -26,7 +26,6 @@ ambient house
 ambient music
 americana
 anarcho punk
-anime music
 anti-folk
 apala
 ape haters
@@ -51,7 +50,6 @@ avant-garde music
 axé
 bac-bal
 bachata
-background music
 baggy
 baila
 baile funk
@@ -449,7 +447,6 @@ emocore
 emotronic
 enka
 eremwu eu
-essential rock
 ethereal pop
 ethereal wave
 euro
@@ -1047,7 +1044,6 @@ new york blues
 new york house
 newgrass
 nganja
-niche
 nightcore
 nintendocore
 nisiótika
@@ -1310,7 +1306,6 @@ sica
 siguiriyas
 silat
 sinawi
-singer-songwriter
 situational
 ska
 ska punk
@@ -1338,7 +1333,6 @@ soul
 soul blues
 soul jazz
 soul music
-soundtrack
 southern gospel
 southern harmony
 southern hip hop
@@ -1472,7 +1466,6 @@ vaudeville
 venezuela
 verbunkos
 verismo
-video game music
 viking metal
 villanella
 virelai