python: Fix multiline quotes in a single line

An example case,
```python
mem_side_port = RequestPort(
    "This port sends requests and " "receives responses"
)
```

This is the residue of running the python formatter.
This is done by finding all tokens matching the regex `"\s"(?![.;"])`
and manually replacing them by empty strings.

Change-Id: Icf223bbe889e5fa5749a81ef77aa6e721f38b549
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/66111
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>

src/python/m5/params.py

@@ -1457,7 +1457,7 @@ class MetaEnum(MetaParamValue):
                 cls.map[val] = idx
         else:
             raise TypeError(
-                "Enum-derived class must define " "attribute 'map' or 'vals'"
+                "Enum-derived class must define attribute 'map' or 'vals'"
             )
 
         if cls.is_class: