Make retaddr default shown in context by default (#2251)

* Rebase after module structure change

* Remove duplicate link-registers in regs.py

pwndbg/commands/context.py

@@ -550,7 +550,7 @@ def regs(regs=[]) -> None:
 
 
 pwndbg.config.add_param("show-flags", False, "whether to show flags registers")
-pwndbg.config.add_param("show-retaddr-reg", False, "whether to show return address register")
+pwndbg.config.add_param("show-retaddr-reg", True, "whether to show return address register")
 
 
 def get_regs(regs: List[str] = None):

pwndbg/lib/regs.py

@@ -248,7 +248,6 @@ aarch64 = RegisterSet(
         "x27",
         "x28",
         "x29",
-        "x30",
     ),
     misc=(
         "w0",
@@ -576,7 +575,6 @@ riscv = RegisterSet(
     stack="sp",
     retaddr=("ra",),
     gpr=(
-        "ra",
         "gp",
         "tp",
         "t0",