cmake: Remove settings from gersemirc only supported via command-line

.gersemirc

@@ -1,11 +1,8 @@
 # yaml-language-server: $schema=https://raw.githubusercontent.com/BlankSpruce/gersemi/master/gersemi/configuration.schema.json
 
-color: false
 definitions: []
 line_length: 120
 indent: 2
 list_expansion: favour-inlining
-quiet: false
 unsafe: false
-workers: 10
 warn_about_unknown_commands: false