Fix test_style failures by removing superfluous f-string whitespace

Author: sadielbartholomew

cf/__init__.py

@@ -89,7 +89,7 @@
 )
 
 x = ", ".join(_requires)
-_error0 = f"cf v{ __version__} requires the modules {x}. "
+_error0 = f"cf v{__version__} requires the modules {x}. "
 
 try:
     import cfdm

cf/read_write/read.py

@@ -990,7 +990,7 @@ def read(
         if info:
             logger.info(
                 f"{org_len} input field{_plural(org_len)} aggregated into "
-                f"{n} field{ _plural(n)}"
+                f"{n} field{_plural(n)}"
             )  # pragma: no cover
 
     # ----------------------------------------------------------------