Change HIDPrefixes -> HIDPrefix

De-plural-ify HIDPrefixes to match common Enum naming conventions

usb_protocol/emitters/descriptors/hid.py

@@ -44,7 +44,7 @@ class HIDDescriptor(ComplexDescriptorEmitter):
             "null": null,
             "volatile": volatile,
         })
-        self.add_report(HIDPrefixes.INPUT, ord(item_flags))
+        self.add_report(HIDPrefix.INPUT, ord(item_flags))
 
     def add_output_item(self,
                   data_constant = False,
@@ -65,7 +65,7 @@ class HIDDescriptor(ComplexDescriptorEmitter):
             "null": null,
             "volatile": volatile,
         })
-        self.add_report(HIDPrefixes.OUTPUT, ord(item_flags))
+        self.add_report(HIDPrefix.OUTPUT, ord(item_flags))
 
     def __init__(self, parent_descriptor):
         super().__init__()

usb_protocol/types/descriptors/hid.py

@@ -15,7 +15,7 @@ from ..descriptor import \
     BCDFieldAdapter, DescriptorLength
 
 @unique
-class HIDPrefixes(IntEnum):
+class HIDPrefix(IntEnum):
     # Main items
     INPUT          = 0b1000_00
     OUTPUT         = 0b1001_00