Remove stray brace from compilation error output

[per1234]

An extra brace was inadvertently introduced into a template literal used to format output text in the event of an error
during compilation. This caused the text to end in a pointless }

For example, compiling this sketch:

#error
void setup() {}
void loop() {}

Previously produced this output:

C:\Users\per\AppData\Local\Temp\.arduinoIDE-unsaved2022014-9692-1u5eon9.v425\sketch_jan14a\sketch_jan14a.ino:1:2: error: #error 
 #error
  ^~~~~
Compilation error: exit status 1}

After this change, the output text is as expected:

C:\Users\per\AppData\Local\Temp\.arduinoIDE-unsaved2022014-9692-1u5eon9.v425\sketch_jan14a\sketch_jan14a.ino:1:2: error: #error 
 #error
  ^~~~~
Compilation error: exit status 1