compiler: remove space at the end of warn/error messages to minimize diff churn

vlib/v/tests/repl/error.repl

@@ -1,6 +1,6 @@
 println(a)
 ===output===
-.vrepl.v:7:9: error: undefined ident: `a` 
+.vrepl.v:7:9: error: undefined ident: `a`
     5 | import math
     6 | 
     7 | println(a)

vlib/v/util/errors.v

@@ -98,7 +98,7 @@ pub fn formatted_error(kind, omsg, filepath string, pos token.Position) string {
 	final_msg := emsg
 	final_context := if scontext.len > 0 { '\n$scontext' } else { '' }
 	//
-	return '$final_position $final_kind $final_msg $final_context'.trim_space()
+	return '$final_position $final_kind $final_msg$final_context'.trim_space()
 }
 
 pub fn source_context(kind, source string, column int, pos token.Position) []string {