Fixed disorienting selection palette on Gruvbox theme (#4626)

Co-authored-by: ryan.palmer <ryan.palmer@servicenow.com>

runtime/themes/gruvbox.toml

@@ -52,9 +52,9 @@
 "ui.help" = { bg = "bg1", fg = "fg1" }
 "ui.text" = { fg = "fg1" }
 "ui.text.focus" = { fg = "fg1" }
-"ui.selection" = { bg = "bg3", modifiers = ["reversed"] }
-"ui.cursor.primary" = { modifiers = ["reversed"] }
-"ui.cursor.match" = { bg = "bg2" }
+"ui.selection" = { bg = "bg2" }
+"ui.cursor.primary" = { bg = "fg4", fg = "bg1" }
+"ui.cursor.match" = { bg = "bg3" }
 "ui.menu" = { fg = "fg1", bg = "bg2" }
 "ui.menu.selected" = { fg = "bg2", bg = "blue1", modifiers = ["bold"] }
 "ui.virtual.whitespace" = "bg2"