debugger: Fix trailing spaces in PPU register dump

Utilities/StrFmt.cpp

@@ -589,7 +589,7 @@ std::vector<std::string> fmt::split(std::string_view source, std::initializer_li
 	return result;
 }
 
-std::string fmt::trim(const std::string& source, const std::string& values)
+std::string fmt::trim(const std::string& source, std::string_view values)
 {
 	usz begin = source.find_first_not_of(values);
 
@@ -599,6 +599,12 @@ std::string fmt::trim(const std::string& source, const std::string& values)
 	return source.substr(begin, source.find_last_not_of(values) + 1);
 }
 
+void fmt::trim_back(std::string& source, std::string_view values)
+{
+	const usz index = source.find_last_not_of(values);
+	source.resize(index + 1);
+}
+
 std::string fmt::to_upper(std::string_view string)
 {
 	std::string result;

Utilities/StrUtil.h

@@ -124,7 +124,8 @@ namespace fmt
 	}
 
 	std::vector<std::string> split(std::string_view source, std::initializer_list<std::string_view> separators, bool is_skip_empty = true);
-	std::string trim(const std::string& source, const std::string& values = " \t");
+	std::string trim(const std::string& source, std::string_view values = " \t");
+	void trim_back(std::string& source, std::string_view values = " \t");
 
 	template <typename T>
 	std::string merge(const T& source, const std::string& separator)

rpcs3/Emu/Cell/PPUThread.cpp

@@ -1153,7 +1153,8 @@ void ppu_thread::dump_regs(std::string& ret) const
 			}
 		}
 
-		fmt::append(ret, "\n");
+		fmt::trim_back(ret);
+		ret += '\n';
 	}
 
 	for (uint i = 0; i < 32; ++i)