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/feature_pruning.py

@@ -195,7 +195,7 @@ class PruneTest(BitcoinTestFramework):
             self.nodes[1].invalidateblock(curhash)
             curhash = self.nodes[1].getblockhash(self.forkheight - 1)
 
-        assert self.nodes[1].getblockcount() == self.forkheight - 1
+        assert_equal(self.nodes[1].getblockcount(), self.forkheight - 1)
         self.log.info(f"New best height: {self.nodes[1].getblockcount()}")
 
         # Disconnect node1 and generate the new chain