fix constant parsing

previously, a `=` in a comment of the constant definition line caused a
wrong identification of the constant's name.

now tested with the following constants:

```igorpro
    StrConstant REQUIRE_MODE1 =	"a\\\"bc" // == OUTPUT_MESSAGE |
    INCREASE_ERROR | ABORT_FUNCTION
    static Constant REQUIRE_MODE2 =	0x3B // == OUTPUT_MESSAGE |
    INCREASE_ERROR | ABORT_FUNCTION
        static Constant REQUIRE_MODE3 =	7 // == OUTPUT_MESSAGE |
	INCREASE_ERROR | ABORT_FUNCTION
	static Constant REQUIRE_MODE4 =	7
	Constant a=1

	Constant c=5
```

Author: Matthias Kastner

procedures/CodeBrowser.ipf

@@ -341,7 +341,7 @@ Function addDecoratedConstants(module, procedureWithoutModule, declWave, lineWav
 
 	// search code and return wavLineNumber
 	Make/FREE/N=(numLines)/T text = StringFromList(p, procText, "\r")
-	re = "^(?i)[[:space:]]*((?:override)?(?:static)?[[:space:]]*(?:Str)?Constant)[[:space:]]+(.*)=.*"
+	re = "^(?i)[[:space:]]*((?:override)?(?:static)?[[:space:]]*(?:Str)?Constant)[[:space:]]+([^=]*)=.*"
 	Grep/Q/INDX/E=re text
 	Wave W_Index
 	Duplicate/FREE W_Index wavLineNumber