cli: avoid "-Wduplicate-decl-specifier" warning in nmcli's resolve_color_alias()

[1/2] Compiling C object 'clients/cli/2641089@@nmcli@exe/nmcli.c.o'.
    ../clients/cli/nmcli.c: In function ‘resolve_color_alias’:
    ../clients/cli/nmcli.c:507:4: warning: duplicate ‘const’ declaration specifier [-Wduplicate-decl-specifier]
      } const aliases[] = {
        ^~~~~

clients/cli/nmcli.c

@@ -504,7 +504,7 @@ resolve_color_alias (const char *color)
 	static const struct {
 		const char *name;
 		const char *alias;
-	} const aliases[] = {
+	} aliases[] = {
 		{ "reset",        "0" },
 		{ "bold",         "1" },
 		{ "white",        "1;37" },