Add missing templates to src subfolder name case checks

The check functions already return this information, but the template was omitted from the error messages. Displaying
the actual file name in the error message may help the user to understand the cause of the check failure.

Author: per1234

check/checkconfigurations/checkconfigurations.go

@@ -1008,7 +1008,7 @@ var configurations = []Type{
 		ID:              "",
 		Brief:           "incorrect src folder case",
 		Description:     "",
-		MessageTemplate: "Incorrect src folder case. This will cause the library to not be recognized on case-sensitive operating systems. See: https://arduino.github.io/arduino-cli/latest/library-specification/#library-root-folder",
+		MessageTemplate: "Incorrect src folder case: {{.}}. This will cause the library to not be recognized on case-sensitive operating systems. See: https://arduino.github.io/arduino-cli/latest/library-specification/#library-root-folder",
 		DisableModes:    nil,
 		EnableModes:     []checkmode.Type{checkmode.Default},
 		InfoModes:       nil,
@@ -1098,7 +1098,7 @@ var configurations = []Type{
 		ID:              "",
 		Brief:           "incorrect src folder case",
 		Description:     "",
-		MessageTemplate: "Incorrect src folder case. This will cause the source files under it to not be compiled on case-sensitive operating systems. See: https://arduino.github.io/arduino-cli/latest/sketch-specification/#src-subfolder",
+		MessageTemplate: "Incorrect src folder case: {{.}}. This will cause the source files under it to not be compiled on case-sensitive operating systems. See: https://arduino.github.io/arduino-cli/latest/sketch-specification/#src-subfolder",
 		DisableModes:    nil,
 		EnableModes:     []checkmode.Type{checkmode.Default},
 		InfoModes:       nil,