Made true color detection method static

src/utils.cpp

@@ -60,7 +60,7 @@ void term::progress(int prefixlen,
     *_out << ' ' << std::setw(3) << perc << '%';
 }
 
-bool term::has_truecolor() const {
+bool term::has_truecolor() {
     char* tc = getenv("COLORTERM");
     std::string colorterm {tc ? tc : ""};
     return colorterm.size() > 0 && (colorterm == "truecolor" || colorterm == "24bit");

src/utils.hpp

@@ -25,7 +25,7 @@ namespace sc {
                           double cur,
                           double total) const;
 
-            bool has_truecolor() const;
+            static bool has_truecolor();
     };
 
     class cursor_hider {