FIX: {end_ang} and {radi} not seen as variables

The formatted string literal (f-string) started at line 1152 is interrupted by the line break. So on line 1153 the variables end_ang, radi and the escape characters {} were not recognised correctly, but were recognised as constant strings, generating the error "Package PGF Math Error: Unknown function `end_ang'/'radi' (in 'end_ang'/'radi')" in LaTeX.
Adding the f-string alias f before the string on line 1153 solves the problem.

svg2tikz/tikz_export.py

@@ -1150,7 +1150,7 @@ def convert_path_to_tikz(self, path):
                 if ang != 0.0:
                     s += (
                         "{" + f"[rotate={ang}] arc({start_ang}"
-                        ":{end_ang}:{radi})" + "}"
+                        f":{end_ang}:{radi})" + "}"
                     )
                 else:
                     s += f"arc({start_ang}:{end_ang}:{radi})"