Fix diminishing company-mode

The diminish call on global-company-mode has no effect. To hide the
lighter of company-mode, we must call diminish on company-mode, not its
global companion.

CHANGELOG.md

@@ -15,6 +15,8 @@
 
 ### Bugs fixed
 
+* Fix `company` still being visible in the mode line.
+
 ## 1.1.0 (2021-02-14)
 
 ### New features

modules/prelude-company.el

@@ -44,7 +44,7 @@
 (setq company-tooltip-flip-when-above t)
 
 (global-company-mode 1)
-(diminish 'global-company-mode)
+(diminish 'company-mode)
 
 (provide 'prelude-company)
 ;;; prelude-company.el ends here