Update tests after frame pointer refactoring

- Remove duplicate xref in cmd_zignature (better precision)
- Remove ARM64 frame pointer test from feat_variables (moved to dedicated test)

Author: vicky-dx

test/db/cmd/cmd_zignature

@@ -1069,7 +1069,7 @@ za sym._dl_malloc g cc=8 nbbs=12 edges=16 ebbs=2 bbsum=396
 za sym._dl_malloc o 0x00002a1c
 za sym._dl_malloc R X2RsX21hbGxvYw==
 za sym._dl_malloc t void sym._dl_malloc (int32_t arg1, int32_t arg2, int32_t arg3, int32_t arg4, int32_t arg_10h)
-za sym._dl_malloc r sym._dl_dprintf sym._dl_dprintf sym._dl_dprintf
+za sym._dl_malloc r sym._dl_dprintf sym._dl_dprintf
 za sym._dl_malloc v fs-4:var_4h:int32_t, fs-12:var_24h:int32_t, fs-16:var_20h:int32_t, fs-20:var_1ch:int32_t, fs-8:var_28h:int32_t, fs-24:var_18h:int32_t, fs-32:var_10h:int32_t, fs-80:var_10h_2:int32_t, fs-76:var_14h:int32_t, tb16:arg_10h:int32_t, fs-28:var_24h_2:int32_t, fs-36:var_1ch_2:int32_t, fs-40:var_18h_2:int32_t, tr4:arg1:int32_t, tr6:arg3:int32_t, tr7:arg4:int32_t, tr5:arg2:int32_t
 za sym._dl_malloc h ec986971438cf486e01f14e9bc442d9f4c457854207d30fe4aa9f1ffdf892911
 EOF

test/db/cmd/feat_variables

@@ -412,20 +412,3 @@ EXPECT=<<EOF
 8
 EOF
 RUN
-
-NAME=ARM64 frame pointer setup should not substitute variables
-FILE=malloc://1024
-ARGS=-a arm -b 64
-CMDS=<<EOF
-e asm.arch=arm
-e asm.bits=64
-wx fd7bbfa9fd030091  @ 0
-af @ 0
-pd 2 @ 0
-EOF
-EXPECT=<<EOF
-/ 12: fcn.00000000 ();
-|           0x00000000      fd7bbfa9       stp x29, x30, [sp, -0x10]!
-|           0x00000004      fd030091       mov x29, sp
-EOF
-RUN