Fixed codegen if exported type name ends with ".Object"

[initial-wu]

Message named Object should be allowed when a package name is specified.

syntax = "proto3";
package foo;
message Object {
    int32 bar = 1;
}

'Object.'.match(/((?<!\.)\bObject\b(?!\.))/g) // null
'.Object'.match(/((?<!\.)\bObject\b(?!\.))/g) // null
'Object'.match(/((?<!\.)\bObject\b(?!\.))/g) // ["Object"]

[alexander-fenster]

@initial-wu Can you please include a regression test that fails without your change and passes with your change, and also fix the formatting so that lint passes? Thank you!