pgedit: Change some variables from global to local ones

This fixes compiler warnings and a warning from LGTM:

Poor global variable name 'pe'. Prefer longer, descriptive names [...]

Signed-off-by: Stefan Weil <sw@weilnetz.de>

src/ccmain/pgedit.cpp

@@ -100,15 +100,15 @@ enum ColorationMode {
  *
  */
 
-ScrollView* image_win;
-ParamsEditor* pe;
-bool stillRunning = false;
+static ScrollView* image_win;
+static ParamsEditor* pe;
+static bool stillRunning = false;
 
-ScrollView* bln_word_window = nullptr;       // baseline norm words
+static ScrollView* bln_word_window = nullptr; // baseline norm words
 
-CMD_EVENTS mode = CHANGE_DISP_CMD_EVENT;  // selected words op
+static CMD_EVENTS mode = CHANGE_DISP_CMD_EVENT; // selected words op
 
-bool recog_done = false;                  // recog_all_words was called
+static bool recog_done = false; // recog_all_words was called
 
 // These variables should remain global, since they are only used for the
 // debug mode (in which only a single Tesseract thread/instance will exist).