Island: Remove extra + from windows environment variable regex

Author: mssalvatore

monkey/monkey_island/cc/ui/src/components/configuration-components/ValidationFormats.js

@@ -9,7 +9,7 @@ const linuxPathStartsWithTildeRegex = /^~/ // path starts with `~`
 
 
 const windowsAbsolutePathRegex = /^([A-Za-z]:(\\|\/))/ // path starts like `C:\` OR `C:/`
-const windowsEnvVarNonNumeric = '[A-Za-z#\\$\'\\(\\)\\*\\+,\\-\\.\\?@\\[\\]_`\\{\\}~+ ]'
+const windowsEnvVarNonNumeric = '[A-Za-z#\\$\'\\(\\)\\*\\+,\\-\\.\\?@\\[\\]_`\\{\\}~ ]'
 const windowsPathStartsWithEnvVariableRegex = new RegExp(
 	`^%(${windowsEnvVarNonNumeric}+(${windowsEnvVarNonNumeric}|\\d)*)%`
 ) // path starts like `$` OR `%abc%`