audio/strawberry: Use iconv:translit

• use USES= 'iconv:translit' instead of 'iconv' to pet Q/A checks about converters/libiconv not declared as a dependency. Source code gives some hints about 'translit': "src/core/utilities.cpp: iconv_t conv = iconv_open("ASCII//TRANSLIT", "UTF-8");"
• reorder variables (pet portfmt)
• bump PORTREVISION

PR: 265290