Merge bitcoin/bitcoin#28291: rpc: removed StrFormatInternalBug quote delimitation

6e8f6468cb removed StrFormatInternalBug quote delimitation (Reese Russell)

Pull request description:

  This PR rectifies an unnecessary set of quotes delimiting the contents of  ```StrFormatInternalBug```. This is a follow up to MarcoFalke https://github.com/bitcoin/bitcoin/pull/28123#discussion_r1297191493.  The method of action was to remove the escaped quotes that were a part of strprintf. A single functional test case was modified to reflect the new output format.

  ```STR_INTERNAL_BUG``` was applied to https://github.com/bitcoin/bitcoin/pull/28123 in ```std::string RPCArg::ToString(const bool oneline)``` in ```rpc/util.cpp```

  The results can be seen below.

  Previously
  ![image](https://github.com/bitcoin/bitcoin/assets/3104223/53f9ea59-317f-4c62-9fc1-04255eeb4641)

  This PR
  ![image](https://github.com/bitcoin/bitcoin/assets/3104223/5c6a3110-f1f3-4b3c-8e8a-9c8f1c3176e7)

  Additional context can be found here.
  https://github.com/bitcoin/bitcoin/pull/28123#discussion_r1271871716

  Thank you.

ACKs for top commit:
  MarcoFalke:
    review ACK 6e8f6468cb
  stickies-v:
    ACK 6e8f6468cb

Tree-SHA512: 35317e31a527630495b566407e37db9941dab7f81cfaeb1ea3309683c48e4273284645ad615f73e646a137b4f2ae35933603e9182a7dbdd22cac98d038c491dc

test/functional/rpc_misc.py

@@ -27,7 +27,7 @@ class RpcMiscTest(BitcoinTestFramework):
         self.log.info("test CHECK_NONFATAL")
         assert_raises_rpc_error(
             -1,
-            'Internal bug detected: "request.params[9].get_str() != "trigger_internal_bug""',
+            'Internal bug detected: request.params[9].get_str() != "trigger_internal_bug"',
             lambda: node.echo(arg9='trigger_internal_bug'),
         )