Do not parse --max-fps float in the client

Many parsing and formatting C functions like strtof() and asprintf() are
locale-dependent. Forcing a C locale just for the conversions in a way
that works on all platforms is a mess.

In practice, this is not a problem, scrcpy always uses the C locale,
because it never calls:

    setlocale(LC_ALL, "");

But the max-fps option should not depend on the locale configuration
anyway.

Since the value is parsed by the client in Java anyway, just forward the
string value as is.

app/src/util/str.h

@@ -66,14 +66,6 @@ sc_str_parse_integers(const char *s, const char sep, size_t max_items,
 bool
 sc_str_parse_integer_with_suffix(const char *s, long *out);
 
-/**
- * `Parse `s` as a float into `out`
- *
- * Return true if the conversion succeeded, false otherwise.
- */
-bool
-sc_str_parse_float(const char *s, float *out);
-
 /**
  * Search `s` in the list separated by `sep`
  *