Enable 3PID add/bind/unbind endpoints on r0 routes

changelog.d/7685.bugfix

+Fix bug introduced on v1.15.0 which meant that some 3PID management endpoints were not accessible on the correct URL.
\ No newline at end of file

synapse/rest/client/v2_alpha/account.py

@@ -682,7 +682,7 @@ class ThreepidRestServlet(RestServlet):
 
 
 class ThreepidAddRestServlet(RestServlet):
-    PATTERNS = client_patterns("/account/3pid/add$", releases=(), unstable=True)
+    PATTERNS = client_patterns("/account/3pid/add$")
 
     def __init__(self, hs):
         super(ThreepidAddRestServlet, self).__init__()
@@ -733,7 +733,7 @@ class ThreepidAddRestServlet(RestServlet):
 
 
 class ThreepidBindRestServlet(RestServlet):
-    PATTERNS = client_patterns("/account/3pid/bind$", releases=(), unstable=True)
+    PATTERNS = client_patterns("/account/3pid/bind$")
 
     def __init__(self, hs):
         super(ThreepidBindRestServlet, self).__init__()
@@ -762,7 +762,7 @@ class ThreepidBindRestServlet(RestServlet):
 
 
 class ThreepidUnbindRestServlet(RestServlet):
-    PATTERNS = client_patterns("/account/3pid/unbind$", releases=(), unstable=True)
+    PATTERNS = client_patterns("/account/3pid/unbind$")
 
     def __init__(self, hs):
         super(ThreepidUnbindRestServlet, self).__init__()