enabled relative mouse by default on all v2+ configurations

configs/kvmd/main/v4mini-hdmi-rpi4.yaml

@@ -17,8 +17,6 @@ kvmd:
 
     hid:
         type: otg
-        mouse_alt:
-            device: /dev/kvmd-hid-mouse-alt
 
     atx:
         type: gpio

configs/kvmd/main/v4plus-hdmi-rpi4.yaml

@@ -17,8 +17,6 @@ kvmd:
 
     hid:
         type: otg
-        mouse_alt:
-            device: /dev/kvmd-hid-mouse-alt
 
     atx:
         type: gpio

kvmd/plugins/hid/otg/__init__.py

@@ -110,7 +110,7 @@ class Plugin(BaseHid):  # pylint: disable=too-many-instance-attributes
                 "horizontal_wheel":   Option(True,  type=valid_bool),
             },
             "mouse_alt": {
-                "device":           Option("",   type=valid_abs_path, if_empty="", unpack_as="device_path"),
+                "device":           Option("/dev/kvmd-hid-mouse-alt", type=valid_abs_path, if_empty="", unpack_as="device_path"),
                 "select_timeout":   Option(0.1,  type=valid_float_f01),
                 "queue_timeout":    Option(0.1,  type=valid_float_f01),
                 "write_retries":    Option(150,  type=valid_int_f1),

testenv/v2-hdmi-rpi4.override.yaml

@@ -11,8 +11,8 @@ kvmd:
         mouse:
             device: /dev/null
 #            absolute_win98_fix: true
-#        mouse_alt:
-#            device: /dev/null
+        mouse_alt:
+            device: /dev/null
         noop: true
 
     msd:

testenv/v2-hdmiusb-rpi4.override.yaml

@@ -10,6 +10,8 @@ kvmd:
             device: /dev/null
         mouse:
             device: /dev/null
+        mouse_alt:
+            device: /dev/null
         noop: true
 
     msd: