Imprment string trimr to remove spaces at the end of aircraft name.

(cherry picked from commit 70fd4039938cdd45f03d541e0aff1238de85fb3e)

firmware/application/string_format.hpp

@@ -58,4 +58,7 @@ std::string to_string_FAT_timestamp(const FATTimestamp& timestamp);
 
 std::string unit_auto_scale(double n, const uint32_t base_nano, uint32_t precision);
 double get_decimals(double num, int16_t mult,  bool round = false); //euquiq added
+
+std::string trimr(std::string str); // Remove trailing spaces
+
 #endif/*__STRING_FORMAT_H__*/