Fix wrong method name for generated code in Slf4j

[christoph-frick]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (2bd36e5) 68.5346% compared to head (4655c74) 68.5310%.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2058        +/-   ##
==================================================
- Coverage     68.5346%   68.5310%   -0.0035%     
+ Complexity      29180      29178         -2     
==================================================
  Files            1422       1422                
  Lines          113496     113496                
  Branches        19548      19548                
==================================================
- Hits            77784      77780         -4     
- Misses          29175      29176         +1     
- Partials         6537       6540         +3     

Files	Coverage Δ
src/main/java/groovy/util/logging/Slf4j.java	100.0000% <ø> (ø)

... and 4 files with indirect coverage changes