Fix compilation error

[csicar]

Running cargo teston the library resulted in compilation errors:

error: proc-macro derive panicked
   --> static_map_macros/tests/tests.rs:11:56
    |
11  |   static CSS_COLORS_STATIC_MAP: Map<&'static str, RGB> = static_map! {
    |  ________________________________________________________^
12  | |     Default: RGB(0x00,0x00,0x00),
13  | |     "black" => RGB(0x00,0x00,0x00),
14  | |     "silver" => RGB(0xc0,0xc0,0xc0),
...   |
160 | |     "rebeccapurple" => RGB(0x66,0x33,0x99),
161 | | };
    | |_^
    |
    = help: message: assertion failed: input.starts_with(LEADING)
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

This PR fixes them