scripted-diff: replace remaining Python test equality asserts

Some Python functional tests still use plain `assert x == y`.
The earlier commits convert the ambiguous assert patterns by hand, so this commit can rewrite the remaining safe cases mechanically.
The verify script excludes `wallet_bumpfee.py`, `test_framework/netutil.py`, and `test_framework/authproxy.py`, which still contain assert forms that the plain line-based substitution would misidentify.

-BEGIN VERIFY SCRIPT-
perl -pi -e 's/^(\s*)assert (.+?) == ([^,#]+?)$/\1assert_equal(\2, \3)/' $(git ls-files -- 'test/functional' \
':(exclude)test/functional/wallet_bumpfee.py' ':(exclude)test/functional/test_framework/netutil.py' ':(exclude)test/functional/test_framework/authproxy.py')
-END VERIFY SCRIPT-

test/functional/test_framework/address.py

@@ -100,12 +100,12 @@ def base58_to_byte(s):
 
 
 def keyhash_to_p2pkh(hash, main=False):
-    assert len(hash) == 20
+    assert_equal(len(hash), 20)
     version = 0 if main else 111
     return byte_to_base58(hash, version)
 
 def scripthash_to_p2sh(hash, main=False):
-    assert len(hash) == 20
+    assert_equal(len(hash), 20)
     version = 5 if main else 196
     return byte_to_base58(hash, version)
 
@@ -144,7 +144,7 @@ def script_to_p2sh_p2wsh(script, main=False):
     return script_to_p2sh(p2shscript, main)
 
 def output_key_to_p2tr(key, main=False):
-    assert len(key) == 32
+    assert_equal(len(key), 32)
     return program_to_witness(1, key, main)
 
 def p2a(main=False):